Description

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory Forward Engineering – moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at our Southern California factory.
- Available in Natural Aluminum Muffler with Carbon End Cap
- Massive Power gains throughout the RPM range.
- Huge weight savings
- New RTS (Rapid Tuning System)
- FMF uses the highest quality proprietary blend of alloy grade titanium made especially to our standards.
- Can be used with FMF or Stock OEM Header

![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/626f8a27-91ff-4a56-93ab-9ba50eb9c82a-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/fc1bcf3b-45e2-4ebc-a439-8a1df855e98b-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/b79ad3c6-29df-49dc-aa40-e89e08611670-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/2f7ec8d8-5f4f-4d0d-be0f-d4ed96a1aa76-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/242336d6-4e94-4616-a1b6-1851fecd1965-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/b5fab46e-b12f-4964-a3d2-a41986b26716-jpg.webp)
![Q4 HEX SLIP ON RMX450Z 2017 S/A MUFFLER ONLY []](https://boydsassets.specd.nz/uploads/2026/09/2146ff26-53d9-4313-a121-5f62f19a4f12-jpg.webp)




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