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Message: [QUOTE="SkySki Jason, post: 110858, member: 1118"] Neither of my trucks had surge - even pushing near 30psi with good tunes and crappy tunes. Someone explained to me the differences are likely related to the casting of the housing(s). Stock is [I]about[/I] .84... but if its actually a little tighter - then ya get surge out of an otherwise identical truck. That said, we put a 1.0 exhaust housing on a truck with BAD surge and it made it better - but did not 'fix' it. 'Live tuning' could not fix it either... I find the 38R/6637 utterly obnoxious when towing. When I put a 'big' turbo on the X, I'm gonna throw the AIS in front of 38R. If that doesn't make it tolerable, I will probably look for a different charger. I drive 50-70k/yr and frankly the added fatigue from all that racket after a 12-14hr day in the cab SUCKS. [/QUOTE]

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