lordhowe Posted November 20, 2011 Share Posted November 20, 2011 I have a 09 Spec.B running stock turbo and headers. I'm debating if i'm should go with a Perrin normal uppipe or the Perrin big tube uppipe. the difference is obvious 1/4" larger in diameter. Has anyone have any issues running the larger diameter uppipe to stock headers and turbo? The stock SpecB doens't have any cats in the uppipe in the first place. Link to comment Share on other sites More sharing options...
grizzlyfarmer2 Posted November 20, 2011 Share Posted November 20, 2011 I've got the M2 which is 2.25 and I'm not happy with spool up. Looking at my dyno printouts and those of others I find my car building boost a lot later. For the $30 I spent I won't complain it fit great. If you don't have a cat I would put the stock up back in unless you plan to upgrade turbos. Link to comment Share on other sites More sharing options...
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