    See our Coupon Code Page for a coupon code to use at checkout. If you want both an FMF exhaust and an aftermarket ECU, please see our CRF450RL/L Exhaust/ECU Bundle page for details. Home > Dual Sport Parts > Honda CRF450RL > FMF Q4 / MegaBomb Full Exhaust Looking for a quiet exhaust system for your CRF450X / CRF450RL / CRF450L? The FMF Q4 is your answer.... from our testing, with the spark arrestor installed, it's barely louder than the stock exhaust. This package deal consists of the FMF Q4 Hex Slip-On muffler and the FMF MegaBomb header pipe. This Q4 system is the quietest full exhaust available for these bikes, while still improving performance over the stock exhaust, and also saving weight. Fitment: ** When installing this exhaust on a CRF450L/RL, you MUST tune the bike appropriately with something like a Vortex ECU. See our CRF450L/RL Exhaust / ECU Bundle for details on how to save money by purchasing an Exhaust and ECU together. Sound: As mentioned above, this is the quietest aftermarket exhaust you can get for these bikes. The sound is really good... and with the spark arrestor installed, it's just barely louder than the stock exhaust. With the spark arrestor removed, it's louder, but not quite as loud as a Yoshimura RS-4 or Pro Circuit T-6. Changes to FMF Q4 Muffler and MegaBomb header: Sometime in 2023, FMF changed the color of the muffler canister from silver (to this dark grey color. Additionally, the MegaBomb header now has the flattened Power Bulge like the ones you see on motocross bikes and is no longer the rounded shape. So be aware that some of our project bike photos and videos will show the old style muffler and header, rather than the newer updated ones. PACKAGE INCLUDES THE FOLLOWING... One (1) CRF450X FMF Q4 Hex Slip-On Muffler: One (1) CRF450X FMF MegaBomb Header Pipe: Helpful Links:  Honda CRF450L FMF Q4 / MegaBomb Video: NOTE: This FMF exhaust system is a performance product and designed for closed course competition use only. By purchasing this product you understand that the parts, installation and performance modifications are not emissions or noise compliant and are for closed course competition use only. ** IN STOCK - Very limited availability. We only have a few of these systems in stock, and once these are gone, it could be another long wait. If you want the quietest exhaust for your CRF450X/L/RL, get one while they last!! Usually leaves our warehouse in 1-3 business days. SHIPPING NOTE: We cannot ship this product to California, Alaska, Hawaii or Canada. If you are from any of these locations and order one, it will have to be removed from the order. |
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