I just installed the Borla ATAK w/o NPP but still with Quad exhaust tips axle back system today, it required me to cut the stock exhaust which at first i didnt trust myself doing but then i ended up doing it anyways. It was probably one of the best decisions ive made, ive asked local dealerships in my area and they were all estimating around $200 just to install it. I literally just bought jack stands and a car jack and used a wrench and it did all the work. Saved $150
