INSTALLED! so it's been on a few days now and no dyno so these are just my impressions. First, I used a different muffler shop tis time an both installers immediately commented on how nice the corksport exhaust was. The racepipe comes with 2 flex springs but the installers said they were too long and sealed the flanges at the connecting spots too tight so they felt there wold be 0 play in the spring and told me it might break at that spot since there was zero flex play. They used some shorter springs that they felt would fit better. I made them explain it all to me again and I agreed. Maybe corksport can chime in on this. The only reason it was so tight that can think of is that I installed the exhaust months ago so the exhaust piping was cut a bit tis time to put on the race pipe. This was nessary because the last muffler shop I went to welded the seams " to keep it tight". Needless to say this shop was much cleaner and let me be in the shop area while they worked.
Impressions: the sound is not louder, but deeper and a bit more aggressive sounding. I feel a bit of vibration from under the car now to compliment the sound and I mean all tis in a good way. We all know how good the 2 " feels" and this added vibration and sound...as minor if increase as it is.. makes the car "feel" even better. I could confidently say that there is a bit more power starting at the end of second gear thru fourth gear. I would guess it's only like 2 to 4 horsepower...just by feeling.
I would recommend this part if you are getting the exhaust. I took so long because I feared TXinspection but no error codes or engine lights have come on so I think I'm good to go. Sorry for the book and ask away if you have any question. Sorry for typos from my phone.