[&:]Just insatlled a Titanium Scorpion exhaust (Bolt on) on my 954 and holy crap it rocks. The sound is amazing, nice deep and not to quiet. It looks great also. I know its just a bolt on but you sure can notice the power increase. Installation was simple and only took 5 minutes. I had an akrapovic on my F4i before and it was nice but to quiet for my liking. I found it on EBay for $150.00 U.S. I looked it up and it actually cost $549.00U.S. so I think I got a good deal. If anyone has any questions on Scorpion exhaust or would like pic's let me know.