Hey just installed me GReddy cat-back. Has a great little rumble at lor RPM <2000 RPM and real smooth through the rest of the revs. Not too loud actuall you can barely hear a difference but there is and it was just what i was looking for. I didnt feel any seat of the pants HP but i definitely noticed a smoother rev and it is a little quicker. Overall i am really happy with what i got. My only problems are that the tip is a little large for my tastes and it doesnt really match up perfectly with the indent on the bumper around the old exhaust. One of my buddies put this on his WRX and said he had to get polyurethane bushings because his bounced too much but i have not noticed a problem. One more thing that makes the muffler a little cooler is that i think the tip is billet aluminum, and if there are any minitruckers in the crowd i am sure they will like that.

 

i like my exaust a lot...i think that the best sounding exaust is a flowmaster muffler with a custom straight pipe from the header back. i think that the sound is perfect. it is not too loud and it is not high pitched. it also flows really well and did not loose too much backpressure when i did this. it also gained quite a bit of hp. especially top end hp which is good for highways. i thought about a greddy myself, but correctly done, the flowmaster can look stock and really mess with people. plus it fits the stock muffler groove well.