I have a 2012 WRX Sedan with a Turbo XS TBE, Cobb intake/access port and finally put this thing on. From the butt dyno didn't feel a whole lot, I really notice it when I am driving at low rpm and low speed and the car doesn't bog down. I lived on a huge hill and had to be in 2nd or 3rd to make it up without the car struggling and after this I could do it in 3rd or 4th. Fit perfect, hardest thing was getting the belts back on. Pretties up the engine bay too. +1 for GrimmSpeed