The Kooks headers get a

from me... With factory cat-back, Kooks 1 7/8s and high-flow cats the car is pretty mild under light acceleration and really only starts yelling when you stab the throttle. I'll see if I can post a vid this weekend. FYI I don't have a base-line # but with LTs, high-flow cats, CAI and a tune we're putting down 423 at the wheels (Mustang Dyno)... pretty decent gain if you ask me