If you look at my exhuast I cut down the pipes on mine and rejetted cause the owner before me looked like he shoved a crowbar in it and spun it but cleaned it out made my own perforated baffle tubes to fit the inside diameter of the pipe inside the megaphone and I got that nasty sound that will make people think your on a 650 bored some people swear I'm lying when I say it's a tiny ass 400 lmao and bikes runs flawlessly ,,,at 1200rpm idle