Ive searched, but didn't find what i was looking for....maybe teh wrong querry. Anyway, I'm puting the greddy turbo kit, along with the Evo2 catback on my car next weekend. I just wanted to know if my stock cat will be a noticable restriction for the turbo, or if I should knock out the cat since I'll have the exhaust apart anyway. What are your thoughts?

 

I am still running my stock cat. I plan on swapping it out for a high flow since it is poisoned.

I would recommend just using the stock cat for now and then upgrading both the downpipe and cat in a custom made setup. You will gain better spool and better high end power.

 

Ok, thanks for the information.