Any power gains?? or low end tourque loss with Greddy catback ?
-J

I just had the remainder of my catback installed today and the butt dyno feels a little more power down low. Mine is not a Greddy but thought this might help you. I have a Cattman bpipe and MagnaFlow muffler.

If your car is NA, I say maybe 5hp

With just a Catback you really don't gain anything.It's more for the sound.

This is what I got with my OBX Catback. I cant imagine them being very different considering the OBX is a greddy knockoff.
Dyno Comparison
peak gain of 6.0hp and 3.4tq
maximum gain of 6.5hp@5800 and 7.1tq@4300

bgates, what is the diameter on the obx piping if you don't mind

2.5in diameter

thats what i thought, somebody led me to believe it was 2.25, thanks for the reply. now to find one

Thats true for a muffler....but a cat back or b pipe will yield gains.....