[bsmith0404]

Keep in mind, the way they gain fuel mileage is by increasing torque. There are a lot of opinions out there about how much of an impact this has on life expectancy. Another thought, cost vs gain. If you gain on average 2 mpg (some do, some don't) using simple math gain from 18 to 20 with average fuel costs of $2.80 per gallon, you would save just over $1500 over 100,000 miles. My guess doing the deletes, exhaust change, and tune will run you closer to $3000 for everything. IMO, that's a long time for return on investment for a truck that already has more than enough power and reliability. Obviously your truck, your decision.