i just bought this for my son and i have a small pipe on the exhaust right next to his right foot. i have no idea what it goes to it does push exhaust out of it.i assumed it goes to the air box but mine nolonger has one so i was going to weld it shut but i wanted to make sure it wasn't necessary to have open i know the one cylinders are very particular about back pressure

thanks in advance
Clutz