We installed the 11 WRX short throw shifter and STI shifter bushing today. I have no idea why the SPT catalog doesn't show them to fit, since they do perfectly without any modifications. It is FAAAAAR better than the stock shifter. It feels much tighter and incredibly more "sport". We did remove the muffler and I drove it for about 5 miles on some twisties and finished on the highway. It is much nicer sounding than some people imply. The exhaust on this car with pzev has three cats and a resonator. It is very restricted and has ample back pressure without a muffler. It is not loud, it is not raspy. As soon as the fabwork is done i'll post pics of the new "muffler".