first. let me introduce myself. im tim and my scoot is a 2005, 1200 sporty custom. i just put on a set of samson big gun 3's and im totally impressed with the sound and performance. engine is pretty much stock, other than SE high flow air breather, thungers slide, and went from .170 main jett to to .190,(i didnt have a .185) a tad rich but she performs well and pulls hard in all throttle positions. i would recommend these pipes to anyone. NOTE: i went with the street sweepers, so i would tell anyone who goes with this setup to make sure they have plenty of ground clearance for the bottom pipe. i just barely scratched my new pipes already on a sharp right turn.yea it really @#$%%$$#@ me off!