TWIN AIR Small Exhaust Plug - 18mm - 40mm 177700NN Youth Yamaha Racing Snapback Hat cylindrical 3-1/2" muffler body in

cylindrical 3-1/2" muffler body in addition to the megaphone style of the original PowerPro

The air induction system (AIS) burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port

Note: Bike side kit attaches to the bike to allow lap top access with the included 4pin tuning cable

Replaces the stock air filter and cleaner backing plate assembly

GMS Full System with included sound insert at Idle 80db GMS Full System with included sound insert at 5000 rpm 97db

TWIN AIR Small Exhaust Plug - 18mm - 40mm 177700NN Youth Yamaha Racing Snapback Hat cylindrical 3-1/2" muffler body inPlug prevents dirt and moisture from collecting in your exhaust pipe