get the race Jardine pipe, I had one on my 98' F3, and it sounded sick, I also had a D&D and a SuperTrapp (they make dirtbike exhausts and a couple street ones) on the same bike, and the Jardine was by far the best. Real powerful sounding, not high pitched like the Yosh's, but less deep than the D&D (too loud, mad backfires). I never had a problem with the pigs about it (except when I wheelied past one high in the revs, but he couldn't lane split in his cruiser...). I agree with notstock, you gotta man up and get the racem its cheaper and less restrictive. You don't ride a bike to play by the rules right?

 

Sorry I was late that reply.... as for the new zx10 I'll stick with my 05....

 

I have an FMF slip-on, but i would'nt recommed it. It sounds ok at high RPM, but then what doesnt. Personally if I had to chose I would go with D&D or yosh. The D&D on the 636 is just crazy soundin! but its your money, unless your buying me one then I'll take the D&D in polished please!