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Not worthless, on the contrary they are quite pricey & for the gain of a few hp & couple ftlbs of torque my Dmax has plenty of both for me.
My son had a 6.0 Ford that didn't need a chip/tuner to blow head gaskets, just turn the key.
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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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