I am thinking about getting a slip on for my 05 FZ6, and so far I have only seen systems from Scorpion, Akrapovic, and Devil Bikes. Anyone else make one? The Akrapovic is considered street and the Scoprion sounds kinda mellow, I hoping for something alittle more agressive sounding. Do any "stores" sell Devil Bikes systems besides Devil Bikes? They have theirs listed for over $700 which is to high for a slip on, but I like the "adjustable" feature they offer.