I just installed my Nismo Y-pipe and R/T cats I got from Performance Nissan. Thanks to Jeff and Jason for all there help with ALL my questions.

The install was fairly easy, It took me about 2 hours to remove the old and install the new. The Y-Pipe is very nice and alot more freeflowing than the stock. The R/T cats are also VERY nice and very good workmanship. There was a good amount of raspyness at about 2500rpms up to about 3500 rpms. But after a day in the car and on the gas, The Rasp is basicly gone. The sound is only a LITTLE louder than stock and is not bad at all inside the car. The car seems to have alot more pep when getting on the gas and a nice sound at WOT. The car seems to Rev a little faster also. All around this was a great mod and works well with the DC Headers and Fujitsubo Legalis R exhaust, Though a little louder would have been a plus in my book.