[CatchM3IfYouCan181]

http://www.youtube.com/watch?v=Q26W7LWy4zk&feature=youtube_gdata_player

Took this from Turner Motor Sports' page for their description of the Borla ATAK:
" This system is light, weighing in at only 34 lbs -- 21 pounds lighter than stock! This exhaust flows much more freely with less restriction than the stock rear muffler section, and features Borla's ATAK™ (Acoustically-Tuned Applied Kinetics) technology. This exclusive technology produces the highest available dB (decibel) levels in the BORLA® street-legal lineup, and is designed for high-performance purists who prefer exhaust notes over their stereos. The focus of ATAK™ is to pump the volume while retaining clarity of sound, at the same time avoiding the drone and distortion typically found in louder exhausts. With ATAK™, the sound output is tuned like a graphic equalizer to shape and focus sound waves for optimum high-volume output. It's made of the highest grade T-304 stainless steel, and has beautifully made symmetrical 3.5 inch quad exhaust tips."

The sound quality on this is amazing and although I've been told that the change in HP & Torque is minimal at 3% of stock by Turner, I can feel the difference. Maybe because of the loss in weight?

I also have an Evolve tune on my car which increases my HP by 10hp with increased throttle response so maybe they work well together.

As I learn more, I'll continue to post and as I do anything additional to the car, I'll post as well.