MattGT_
Well-Known Member
MattG - did you swap in the H-pipe prior to installing the GT500s, or was that part of this project too? How much louder is this combo over stock? I'm thinking of going the same route, and adding a JLT CAI for good measure.
the hpipe I done a week before I got my hands on the GT500s, just having the hpipe isn't to much of a difference over stock IMO while still having stock mufflers
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