I have a Tanabe SMR on mine, it sounds sweet, don't know about the dyno number, but I definately felt the difference once it was on there, besides, it saves you some big bucks. Amuse is nice, but do you really need to go that radical? the weight you saved is back if you put on some stereo system, just something to think about there
( makes no mistake, I would never spend money on anything that does not make the car go faster )