Would there be any problem by installing header with stock CAT (and taking out one vertical CAT)?
I live in Cali, so I am worried that it might not pass the emssion test.

 

No Gb High Flow for you?

 

Yes, I am in high flow CAT, but I'm considering keeping my stock CAT since I have 2.5" custom exhaust. I am worried that putting 2.5" CAT might decrease the low end performance even further.

 

What about a glass pack over another CAT? would that help? As I hear that on Saturday...my Tibby will be screaming. and I might just need a Glass Pack. Any url's?...Where is your second O2 sensor located? Please chk my other post in 4-1 GB..(most recent one..hehe) and goto the web page...chk out the master piece
drawing...thanks