I have a dp and high flow cat (among other mods). I ran the car first with a stock catback, then with the RB dual tip. The stock catback seemed to give more mid range torque but the RB gave more high end flow and a little more power at the top of the rev range. But the difference is not very dramatic so if you are concerned about noise then going to a stock catback should be a fair trade off.

I replaced my stock cat with the RB dual tip when I purchased my car years ago. I noticed the difference immediately. I like the sound from the RB dual tip. Definitely less noisy than most performance CB out there.

:) I'm sure you meant catback...

Dave

Yep..meant stock cat back. Sorry!