The Factory 4.1 system will give you a noticeable increase in all around power, and also shed some weight from your machine. Superior power on stock and big bore motors and the centralized mass improves handling.
FMF takes fun seriously, so they built the Mini Factory 4.1. This is 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!
The lightest available.
Superior power on stock and big bore motors.
Patented Chamber Core for optimum performance.
Engineered for compactness and centralized mass.
Exclusive mounting design.
Easily serviced for re-packing.
Note: For closed course competition use only. Not intended for street use.