NEWB QUESTION.....What cat. would i use if i did a 2.5 collector mod.
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From: Bay Area, xx, united states
NEWB QUESTION.....What cat. would i use if i did a 2.5 collector mod.
I'v been told to do a 2.5 collector mod for my 99 Si. when i order header. i have a fabricated 2.25 exhaust system. i was wondering where the cat. fits into all of this. what cat do i use. i live in CA and i need to pass smog. 
I love to drive
Joined: May 2004
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Re: NEWB QUESTION.....What cat. would i use if i did a 2.5 collector mod. (Delano5050)
It won't bolt right up, but the ITR cat is 2.5". But I would probably just get a Magnaflow 2.5" cat and get a muffler shop to weld some flanges on it.
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