How does the Power Bomb module improve exhaust flow?

The Power Bomb module is a pre-muffler that allows exhaust gases to expand and cool. This process helps ramp up air pressure at higher RPMs, contributing to a flow increase of nearly 10%.

Will this muffler make my bike quieter?

Yes, the Q4 S/A Muffler is designed to lower your bike's sound output. The Power Bomb module provides additional surface area for sound absorption, making it quieter than stock.

What is the primary benefit of this muffler for my Honda CRF250R/X?

This muffler offers a combination of improved exhaust flow, leading to better performance, and reduced sound output. The patented Power Bomb module is key to achieving these benefits.

Specifications

Brand: FMF Racing
Part #: 041249

FMF Racing Honda CRF250R 04-05/CRF250X 04-09/ 12-17 Q4 S/A Muffler

Name: FMF Racing Honda CRF250R 04-05/CRF250X 04-09/ 12-17 Q4 S/A Muffler
Brand: FMF Racing
SKU: fmf-racing-fmf-racing-honda-crf250r-04-05-crf250x-04-09-12-17-q4-s-a-muffler-t14-686902
Price: 495.35 USD
Availability: BackOrder

$495.35

On Backorder — Expected to ship by Apr 28, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

FMF Racing Honda CRF250R 04-05/CRF250X 04-09/ 12-17 Q4 S/A Muffler. Features patented Power Bomb module for improved flow and reduced sound.

Key Features

Fits Honda CRF250R (2004-2005) and CRF250X (2004-2009, 2012-2017).
Incorporates FMF's patented Power Bomb module for improved exhaust flow.
The Power Bomb module is positioned in the initial stage of the header system.
Contributes to a flow increase of nearly 10% through the exhaust system.
Acts as a pre-muffler to help lower the bike's sound output.
Provides increased sound-absorbing surface area for exhaust gases.

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About this part

Product Details

FMF Racing is well-known for making performance exhaust systems for off-road motorcycles. This Q4 S/A Muffler is built for your Honda CRF250R from 2004-2005 and CRF250X from 2004-2009 and 2012-2017. It's designed to give your bike a noticeable boost in performance and a more controlled sound level.

At the heart of this muffler is FMF's patented Power Bomb module. Placed strategically in the header system, this module helps increase exhaust flow by nearly 10%. It works by allowing exhaust gases to expand and cool within the system, which ramps up air pressure at higher RPMs. Think of it as a pre-muffler; it adds more surface area for sound absorption, helping to lower the overall sound output of your bike while improving how efficiently the exhaust gases exit.