I had my B&B cat back resantor system installed today and it is swank. I was a little apprehensive about resonance or drone after reading some of posts on the Forum. There is a slight amount of drone below 1500 rpm but it quickly departs and leaves a very pleasing deep, but not very loud exhaust note inside the car. Highway cruising is 100% drone free. Outside the car it is plenty loud but not loud enough to attract an unwanted amount of attention. But my taste leans a little to the loud side, (in my younger days my daily driver was a 993 with track pipes). The installation was also pretty easy, according to the installer. It took 1hr and he charged $65. Nice. I am very pleased and would highly recommend this system to anyone. Oh, and in my opinion the huge tips look much better than anything else on the market.