Had boost-solutions put the 2 metal shifter bushings and turbo xs dp. The bushings made it a little easier/smooth to shift I guess there is an improvement I might need the 8 piece metal bushings also. The turbo xs dp on the otherhand made a pretty realistic difference. I could definately feel more power top end. Kind of a pain in the *** to perfectly match up with the cat but I need a test pipe or high flow anyways.