well, just to aid in your decision making, the cat-back exhaust didn't give me a noticeable gain in power, feeling wise, it only helped my 1/4 mile time by about a tenth or so. If you want power, go for the AEM CAI (cold air intake) and a header. I just ordered a DC CC, they're supposed to give us Si lude owners about 8 HP to the wheels. I ordered my header from morepowerracing.com for 313 shipped, and got my intake through lightningmotorsports through a groupbuy for 190 shipped. Got my RS*R cat-back for 370, had to pick it up, but you won't find one, not a new one anyway, I just happened to get DAMN lucky. And Chris, that's nice that you like your greddy, they don't make a header for the H23.
