In this video, I install a FMF q4 exhaust on my 2019 CRF 450L. The bike already has a Vortex ECU, Stealy weighted flywheel, and Reckluse Clutch. This exhaust complicated the uncorking of my bike and made it a true 450. At the end of the video, I do a ride text and short review of my impressions of the FMF.
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