Im using the Flowmaster and I love the way it works ($215. Summit). I actually had a Borla first but it was too loud inside the car at freeway speeds (I like music inside and a nice exhaust tone outside). The Borla actually seemed to to get quieter the higher the the RPMs go up. The Flowmaster is really quiet inside the car almost like stock. On the outside it rocks, the harder you step on it the more it snarles. My only mod is intake and the flowmaster is a 2" system. Im not doing any more mods, but if your planning on maxing out your engine with everything that you can possibally bolt on to it You might want to consider the Yo Dude 2 1/4" with the Flowmaster muffler.