The finished product sounds great, but until I replace the exhaust pipe with same size as the STi it's not quite as loud, but I have that great boxer growl. I'll upload a video as soon as I can. Royal Purple Differential Fluid-Change (11/11/2011) I always put Royal Purple in the engine, why not the Diffs? So I finally set aside enough time in a friends garage since it was the middle of winter and swapped the fluid out. One after draining the old fluid I'm pretty sure it was original, which is kind of scary considering it had roughly 210K miles on it at that point. The rear is pretty easy to do with a floor jack and jackstands under each side in case the jack moves. But be warned, gear oil is the most foul smell I've ever encountered.