From what I've been able to find out, the only significant performance gain in the exhaust department is from long tube headers. As noted previously, that will require removal of the cat-converters. While a tuner can correct/ignore that removal issue, the law won't (ignore the removal). Some states won't even know you did this (no inspections), and other states will quickly hammer you into the ground finacially with fines, etc. You may also have to re-install the cats to resell the truck later...$$$$
Most guys seem to just install noisy cat-back systems. My understanding is that if the pipes go straight out the back, when they floor the pedal the noise shock waves rebounding off my windshield actually add 15 HP to their butt dynos.
Now if the weather would just clear/warm up, I could get my brand new Gryphon installed...
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