what is everyones favorite exhaust + DP combo for the 09 wrx sedan? I love the Perrin but it is a bit pricey. The Turbo Xs sounds almost as good and is $500 less. I was looking at getting the Invidia High flow cat DP.
I just traded out my Cobb catted DP for a cat less Invidia. I am running the SPT CBE, AEM CAI and Grimmspeed BCS and protune. Just the change in DP I picked up 9 WHP and 35 ft lbs WTQ. Cat vs. Non cat makes a big difference. Cobb is a quality part no doubt, but never heard anything bad about Invidious either. Time will tell. Good luck.