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Factory catback restrictive?

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Just wondering what power the factory cat back can push? I have 4"dump-5"cat, but I am quite happy on how quiet it is off boost and cruising around. 


Currently making 375rwkw but getting it set up for e85. Just wondering if I should replace the factory cat back? 



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once you go e85 you will be around the 400kw mark. so most guys do get a 3.5inch at least. I would say it will hold you back.


otherwise if you happy with low noise around town try the varex mufflers but not cheap. 

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@Slowxr6t if you want a response from people in an old thread, you should tag them like I tagged you. That way they will receive a forum notification and in some cases an email notification too.


You literally type the @ symbol and then start typing their name. It'll come up with a list of members, and when you see their name just click on it.

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