Well, after erroneously being sent a set of SIL Motor c/f oval no baffle slip-ons for an ST4 and having to exchange them for a set for an ST3, I was finally able to slip them on this eve. They fit very well, with no problems other than to re-set slightly the adjustable hanger to match the threaded hole in the luggage bracket. They are very well made re fit and finish, and sound way cool. Nice deep rumble at idle, and it doesn't take many revs to get 'em singing. I'm a very happy camper to say the least, now that I can hear my baby purr like she was meant to. Sounds sexier than my old Harley with full stepped header pipes. I hope to get a dyno run in next month just to see how they pull but I'm holding-off on any PCIII/Techlusion until I run it a bit to hear how it sounds on decell etc, as I'm not making air box mods right now. I can hardly wait to go for a spin and get it up to red line. Yeeehaa! Oh ya, forgot to mention, the stock canisters weigh approx 11 lbs each, the SILs, *maybe* 2 lbs! That's a *significant* weight savings IMO.