I purchased a P2R TBS being highly skeptical thinking that it would do next to nothing in terms of performance based on everything i have read. After installing it today i will say the car actually feels a lot better in regards to to throttle response and i was highly surprised that it actually eliminated that bucking sensation when driving slow in a low gear. Also didn't hear much of that whistle that everyone talks about either but then again it's kinda hard to hear anything over a skunk2 exhaust....