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01-31-2019, 09:21 AM
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#1
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Senior Member
Join Date: Dec 2018
Location: Sun City
Posts: 168
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K&N Cold Air Intake on '08 Ram 3500 w/6.7 Cummins
I recently put a K&N cold air intake system on our 2008 Dodge 3500 with the 6.7 Cummins in it. Just puttering around the neighborhood, I didn't really notice much difference. But over the weekend, I went for a little trip (not pulling the 5er) and accelerated like I usually do on the entrance ramp to the freeway. Before I got to the end of the ramp, about 100 feet before I could get over into the lane, I glanced down and was surprised to see that I was already going just over 75 mph!
Then I pulled the 5er around up to 55 mph and it seemed to have improvement there as well.
I don't know if the system actually gives the extra 20.63 hp or 43.35 lbs of torque, but judging by the highly scientific "seat of my pants" method, it does seem to be an improvement.
It was a pretty simple install.
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01-31-2019, 09:29 AM
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#2
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Senior Member
Join Date: Feb 2014
Location: radium hot springs bc
Posts: 2,007
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That is interesting. Always thought from my souping up engine days the theory was "more air in needs more exhaust out" to get more power.
__________________
2018 Ram 3500 6.4 Harvest Edition
2018 Cougar 27RESWE
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01-31-2019, 09:41 AM
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#3
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Senior Member
Join Date: Dec 2018
Location: Sun City
Posts: 168
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Quote:
Originally Posted by 66joej
That is interesting. Always thought from my souping up engine days the theory was "more air in needs more exhaust out".
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I know what you say was true back in the 70's when I was doing stuff like that on motorcycles. I don't know. You transfer the air intake sensors from the factory system to the K&N system, so I don't know if that makes a difference. Or maybe it just lets the turbo work better?
Who knows. Maybe the performance boost is all in my mind -- but it does sound a little better!
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01-31-2019, 03:06 PM
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#4
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Senior Member
Join Date: Nov 2012
Location: Fruitland
Posts: 3,357
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Different trucks, but my results. 96 7.3 I got a bigger down pipe from turbo to under vehicle cost 200. Made to increase mpg/hp. Really not much noted except a louder exhaust, louder inside cab also. I ran that for a month or so than added the K&N cold intake around 400 if I remember right. No real noted difference, maybe if I put it on a tester before and after there was some gain.
This truck I have had the cold air intake on it maybe since 2004. Not really noted any difference.
I think better air flow is good but I am not making any vehicle exhaust louder again. I think I out grew that at 21.
No matter how good the sales pitch is on aftermarket bolt ons. I like to weigh the cost and pay back time for using those. My 96 was a waste of money on my part. This truck may have gained enough thru time to do better.
__________________
2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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01-31-2019, 03:56 PM
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#5
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,223
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Maybe it feels better, because it cost so much. Oiled air filters are bad beans on a diesel. They may let more air in because they filter less. I would suggest getting a large paper element (AKA BHAF).
https://www.amazon.com/Cummins-Upgra...haf+air+filter
__________________
Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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01-31-2019, 04:08 PM
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#6
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Senior Member
Join Date: Dec 2018
Location: Sun City
Posts: 168
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Quote:
Originally Posted by rhagfo
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Again, it's not an oiled air filter...
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01-31-2019, 08:38 PM
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#7
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Senior Member
Join Date: May 2015
Location: Rockett, TX
Posts: 481
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Quote:
Originally Posted by 66joej
That is interesting. Always thought from my souping up engine days the theory was "more air in needs more exhaust out" to get more power.
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The cold air kits don't necessarily provide more air, the idea for most of them is to provide cooler air by relocating the air filter to an area that does not receive as much engine heated air (as in moving the filter from the engine compartment to the wheel well). Cooler air is denser so the increase in power.
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Jerry & Debbie
with Fur Babies Sasha & Sam
2018 Alpine 3401RS
2019 Ford F350 SRW
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01-31-2019, 08:48 PM
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#8
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Senior Member
Join Date: Jan 2016
Location: Oregon
Posts: 247
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Quote:
Originally Posted by Old Mustanger
The cold air kits don't necessarily provide more air, the idea for most of them is to provide cooler air by relocating the air filter to an area that does not receive as much engine heated air (as in moving the filter from the engine compartment to the wheel well). Cooler air is denser so the increase in power.
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From a physics standpoint this is pure snake oil. So, does a truck all of the sudden accelerate quicker on a 40 degree day versus an 80 degree day? Does it accelerate quicker first thing in the morning before the engine gets hot? I've never noticed any difference driving my trucks from temps in the teens to temps over 100. I stopped paying attention to K/N filters years ago after reading some pretty comprehensive studies totally de-bunking their effectiveness (not to mention all of the potential damage with CELs and whatnot). If what it's come to is saying the benefit is cooler intake air, it's laughable.
I'm really not trying to be a downer but I just can't resist pointing out the ridiculousness of this particular argument by the manufacturer.
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01-31-2019, 09:00 PM
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#9
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,692
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As I watch the thread progress I just have to add/say:....
I've added 2 aftermarket cold air intake systems in my life....what a waste. The 2nd was with all the "stuff" to increase "outflow". Increased airflow, new exhaust, chip etc. Never in my life have I spent so much, expected so much and received so little....except NOISE! Today's modern, computer controlled fuel injected engines won't give you some magic increase in power with a cold air intake. Good sales ploy but not proven out by science IMO.
__________________
Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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01-31-2019, 09:02 PM
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#10
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Senior Member
Join Date: May 2015
Location: Rockett, TX
Posts: 481
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Quote:
Originally Posted by mtofell
From a physics standpoint this is pure snake oil. So, does a truck all of the sudden accelerate quicker on a 40 degree day versus an 80 degree day? Does it accelerate quicker first thing in the morning before the engine gets hot? I've never noticed any difference driving my trucks from temps in the teens to temps over 100. I stopped paying attention to K/N filters years ago after reading some pretty comprehensive studies totally de-bunking their effectiveness (not to mention all of the potential damage with CELs and whatnot). If what it's come to is saying the benefit is cooler intake air, it's laughable.
I'm really not trying to be a downer but I just can't resist pointing out the ridiculousness of this particular argument by the manufacturer.
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Didn't say they do what is advertised, just what the idea is, but I'd swear that on every 'Stang that I installed one on it made a difference. YMMV
__________________
Jerry & Debbie
with Fur Babies Sasha & Sam
2018 Alpine 3401RS
2019 Ford F350 SRW
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01-31-2019, 09:33 PM
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#11
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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Polaris Slingshot SEL models have a "specialized cold air intake"
Polaris Slingshot SL models have a "standard air intake"
The factory specs on both are exactly the same HP and torque.
The engine is a 2.4l GM 4 cylinder automotive engine. If there was "something more than talking points" to cold air intakes, I'd guess that Polaris would "talk up the improvement in performance" but they list the specs as the same for both models.
Makes me wonder about cold vs ambient vs underhood air temperature and if there's any difference in burning it in a fuel mixture in a high compression engine that "explodes the fuel/air mixture without a spark.... It's more a matter of how much air the "hot turbo vanes" can push into the engine cylinders before the valves close and detonation occurs. With an intercooler to "chill the air mixture" I wonder what a cold air intake adds to the mix ???
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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01-31-2019, 10:19 PM
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#12
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Member
Join Date: May 2018
Location: San Ramon
Posts: 75
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So...
A cold air intake on a engine with an exhaust driven compressor? Hmmmm.
Ok, I too ran a K&N cold air system on a small block Chevy with an aftermarket exhaust that made nice noise but didn’t do much that I could tell. It was an oiled filter that claimed the dirtier it got the better it worked. That just made me reconsider the effectiveness of the media when clean.
I won’t do it again on a street motor.
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Truck & trailer...yes
They have many features and upgrades, more than I can list, so much, did I mention they are well equipped, I don’t know if I have enough room here....and I really don’t think you care anyway, so nope
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02-01-2019, 07:11 AM
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#13
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Member
Join Date: Nov 2016
Location: Livingston
Posts: 92
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I have tried both dry and wet aftermarket cold air intake systems over the years. I think they are a waste of money. I have also read that until you get over 600 HP the stock intake system works as well as the aftermarket systems.
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2017 Alpine 3301GR
2019 Ram 3500
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02-01-2019, 08:19 AM
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#14
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Senior Member
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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Quote:
Originally Posted by sourdough
As I watch the thread progress I just have to add/say:....
I've added 2 aftermarket cold air intake systems in my life....what a waste. The 2nd was with all the "stuff" to increase "outflow". Increased airflow, new exhaust, chip etc. Never in my life have I spent so much, expected so much and received so little....except NOISE! Today's modern, computer controlled fuel injected engines won't give you some magic increase in power with a cold air intake. Good sales ploy but not proven out by science IMO.
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I've done the very same! But 20+ years ago it was cool, sounded good, rolled lots of coal, but as far as more hp/torque or better fuel economy, I never realized either. All the expensive add-ons may have increased the mileage 1-2 mpg so in 50 years or a million miles they might have paid for themselves.
Nowadays the new diesels have as much or more hp/torque than most of us would ever need along with decent mileage & will most likely increase every year with the big 3 "mines bigger" mentality.
If you want to add on cool things to your truck then have fun, but don't expect miracles in power or mileage, it's just for fun. And remember some of those add ons may void any warranty you may have.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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02-01-2019, 08:32 AM
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#15
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Senior Member
Join Date: Dec 2018
Location: Sun City
Posts: 168
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Wow. This turned into being just as opinionated as a "best oil" or "what tire brand" thread. LOL.
I don't really care one way or the other. I just threw it out there as my experience. Never expected such intense reactions.
Ya'll have a good day.
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02-01-2019, 08:47 AM
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#16
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Senior Member
Join Date: Nov 2012
Location: Fruitland
Posts: 3,357
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There is a difference in an opinion and experience. I gained from what you said and if you read my post you should have gained some knowledge from my experience. None of which is bad it is just different.
__________________
2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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02-01-2019, 08:53 AM
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#17
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Senior Member
Join Date: Dec 2018
Location: Sun City
Posts: 168
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Quote:
Originally Posted by Ken / Claudia
There is a difference in an opinion and experience. I gained from what you said and if you read my post you should have gained some knowledge from my experience. None of which is bad it is just different.
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I agree. You posted your experience. Others posted their opinion.
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02-01-2019, 09:19 AM
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#18
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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I do have a K&N filter on my ‘94 turbo IDI and my 2004 Honda Accord. Does the filter improve performance? I can’t say because I did a bunch of upgrades at the same time. I know someone that has a K&N on his 2002 F250 7.3 PSD. He drove in dusty conditions for 3+ yrs without servicing his filter. When I did some work on it we cleaned and oiled it as directed. He called and said his truck suddenly had more power, and I personally looked at the turbo for any sign of “dusting” and found nothing.
That’s about as real as I can make it. To each their own, but if you feel it made a difference then by George it did!!
I agree these threads can get into best oil, additive, brand of truck, etc....thank you for posting YOUR experience.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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02-01-2019, 09:31 AM
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#19
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Senior Member
Join Date: Mar 2014
Location: Mountain Home, Idaho
Posts: 3,013
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It’s an option some think is great. I’ve kept mine stock. I don’t have issues with foiled MAP or MAG sensors from oil residue getting on the sensors.
For me the $300 for the cold air kit goes a long way for tranny fluid and filter, fuel filter, new differential and transfer case lube, etc.
I’ve not missed the advertised 20hp increase.
But it looks nice
https://www.knfilters.com/mobile/col...-intake-system
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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02-01-2019, 10:20 AM
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#20
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,692
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Quote:
Originally Posted by daveinaz
I agree. You posted your experience. Others posted their opinion.
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Many in the thread posted their personal experiences; a few posted opinions. Either way, I don't think anyone has been "out of line", irate or ugly. Because many didn't experience your "seat of the pants" feeling of improvement doesn't mean they are attacking you - just relaying their experience. If you believe your changes netted you an improvement, real or imagined (seat of the pants vs measured), you got your money's worth it would seem and I hope you continue to realize improvement from your mods.
__________________
Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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