i'm looking to put in a JWT Twin turbo along with some engine mods including a short block to try and get about 450-500ish whp.. i have to keep my car street legal as i drive it daily.. i was told a Fast Intentions high flow cat would be a good fit.. in the exhaust system i wasnt sure where i should go . i was looking at:
APS True Dual 2.5" Cat back system
APS 3" high output Cat back system
Fast Intentions Intimidator cat back system..
I was looking for some input and to see if the APS 3" was more than needed b/c i had a Cat to begin with.. looking for the best bang for my buck... if you have any other exhaust systems that would be great too .. or if you have heard better things about a different Cat.. Thanks!

 

well if you are going with a tt set up i would get 3" exhaust