My exhaust does sound really good, its loud and has a really deep tone, I get told all the time it sounds like a 400cc bike.

The header pipe that comes with it is just trash, it wont fit our bikes and is made for a 50cc scooter application.

Even though it says its for a 50cc that doesnt matter, this thing has a huge inner diameter and flows great on our engine.

I replied to your post about the SAI in another thread. But the SAI justs injects air into the exhaust stream to burn excess gas fumes that the engine didnt burn causing everything to run alot hotter.