I had mine installed along with the Quaife so everything was out of the car so can't comment on the install. The car is pretty loud with borla and off road y-pipe. I had dynoed before the headers at 175hp/151tq after headers 179hp/156tq. The big difference was about 15 to 20 lbs/ft down low, but only around 4 to 5 lbs/ft in the upper rpm. With the stock exhuast replaced with Borla power is 184hp/157tq. The headers made the car run lean so there should be more power with a custom chip that adds fuel and timing. Hopefully next week.
