Apexi N1 Exhaust \-lease Help Me!

[maxperformance]

I just purchased the apexi n1 cat back for my eclipse gst. My car has a B16G turbo and HKS SS BOV and intake. What kind of gains or anything will i notice with this exhaust, besides it being loud? Real quick please just let me know.

 

[al5dsm]

not sure of the gains on the stock cat..... have to talk to other people in that i got mine on, but my car is still in the shop..... get a downpipe and a high-flow cat and you will notice a real difference.... but i think w/ just the catback, you will notice a slight difference