Quote:
Originally Posted by Jericon
Yup... didn't even think to search. Thanks.
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It's all good. 2.5", 2.75" and 3" have been discussed pretty extensively.
In a nutshell, for the NA vehicle 2.5" is fine.
Any form of FI will benefit from larger diameter piping.
If I were even thinking about FI, I would go with 3" or at the minimum a 2.5" overpipe, larger and less restrictive front pipe and a 3" catback section.
Then it's a matter of what sound you like.
The benefit of larger diameter piping with a FI setup is that you're adding more exhaust gas and it needs to go somewhere. The larger piping keeps excessive exhaust gas temps down and will build boost, on a turbocharged setup, quicker than smaller diameter piping. There may be some weight savings as well. Oh...and it sounds cool.