Just bought the following from Dan at wesellcarparts.com for my 2007

Fujita CAI - Black
Megan s-pipe
Megan Mid-pipe
Megain OR-RS muffler

Also some headerwrap for the intake, to minimize heatsoak.

I'm looking for around a 10whp gain on peak, with the powerband shifting to the right. Does that sound reasonable? I'll be installing these parts as well as my poly motor mounts all at the same time, which might give me an outside chance of noticing an overall difference in the performance of the car. If not, oh well. at least I could keep the exhaust if I ever go FI.

Had a great experience with him, answered all my questions via AIM, even helped me out with some paypal problems that I was having.

 

Of course you'll notice power, probably more than 10hp also. My injen CAI adds noticeably more high-end power. Deleting that midpipe cat with that new midpipe and getting rid of the gigantic, heavy, restrictive stock muffler will help tremendously too. Congrats.