Factory catback restrictive?

[rio]

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? 

 

Cheers

[bossmang]

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. 

[rio]

Think I will just have to compromise as im chasing 450+ cheers

[bossmang]

well yer if your going for 450 +++++ def get one then 

[Slowxr6t]

Hi Rio, what turbo did you have on your car and what boost did you run to do 375rwkw? Is it a fg model, Thanks

[Puffwagon]

@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.

[Rab]

Which car?

[Slowxr6t]

Thanks puff

[Slowxr6t]

 @rioriohi rio, what turbo and what boost were you running when you had 375rwkw on stock cat back exhaust, was it an fg model? Thanks 

[bossmang]

its probably a f6 turbo