Exhaust installed, MDesign Race Spec Prototype 1.
Pros: Increased power/quicker spool, better gas mileage, and now gurgles when you blip the throttle, sounds beautiful downshifting
Cons: Drone in 1800-2500RPM
Performance gains are confirmed via SCT X4 tuner. Under cruising and slight blipping of the throttle (1000-2000 RPM range) most of the time I am at -10 vacuum up to 0psi pre exhaust, post exhaust I now hit 2psi doing the same thing. Also I spin the tires effortlessly now, whether it's from a dig or roll on 1-2 and 2-3 shifts. While there is no rasp whatsoever and no drone in other RPM, the drone that is only noticeable in the 1800-2500 RPM range is a bit much to my liking therefore I'm willing to sacrifice some performance for sound reduction.
As of now I am contemplating using an oval shaped resonator up front which should eliminate drone considering the system is completely free-flowing, though am not sure if I want to stick with the original design (JimiJack's dual inlet/outlet resonator) or a wider and larger volume single in/out.
