Big Bottom Kit for 2017-21 EXC-F /XCFW / FE-S / FE 450 / 500 / 501
Save $25 when you combine the new Power Intake Tube with the grunt exhaust manifold. Together they are a huge improvement in pulling power, from just right off of idle all the way to wide open. Requires either using the piggybcak fuel programmer to get enough Fuel to the bike when adding all the extra air this kit adds. The big bottom Kit is a big power increase, after opening the intake and increasing Fuel.