Right now i have just the Stillen b-pipe and Stillen muffler. I want to improve my performance with a Warpspeed y-pipe and Random Technology super hi-flow cat.

How would the sound of my exhaust system change with the new y-pipe and cat?

(Not that it really matters because i love the sound of my Injen CAI, I'm just curious.)

 

The stillen catback sounds good with stock y-pipe. The warpspeed y-pipe being unequal length, will make it sound pretty ghey, and the stillen catback lacking a resonator will be loud and raspy. The highflow cat does not help at all either.

It will sound a lot deeper and more v6 mustang sounding, comapred to now it will sound more along the lines of the VQ35.

 

My car:
http://www.youtube.com/watch?v=U7hk1w_fT4k&fmt=22

Warpspeed Y-Pipe, Stock Cat, Stock B-Pipe, Stillen Rear Section.

 

It will be loud and really raspy....your call.

Next time try searching the exhaust sticky to see if you can find something similar though.