I just installed my CS sri/tip yesterday. The install was painless, as the fitment was perfect. The quality is very good and for the price, it's a great bang for your buck mod. I finally got a chance to put some miles on this morning. Noticeable seat of the pants power increase and you can certainly hear the intake/turbo. The turbo might be a little more responsive as well.
Also worth mentioning is Corksport's customer service. It's top notch.