FMF Factory 4.1 Mini Full Exhaust System

FMF takes fun seriously, so they built the Mini Factory 4.1 exhaust system. It’s an all-out performance exhaust for play bikes. With the Mini Factory 4.1, you will be the king of backyard motocross and look great doing it! Each system provides superior power on stock or big bore motors and comes ready to install right out of the box.

Superior power on stock and big bore motors

Stainless steel Hi-Flow header with better flow over the stock design for improved throttle response and greater engine power output, especially at low RPMs

Customize with tuning inserts and spark arrestor (sold separately)

Comes with all required mounting hardware

100% made in the USA

Product Note: