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

![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/3d6b8dc5-90b3-463e-892a-82e4c87aa134-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/ec6c519f-0401-4bb7-9470-46a7b1f74064-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/226b745d-2417-42f4-9d12-dd96975ea55a-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/40aa9d43-5585-4681-9465-3dd03b4d5b6c-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/cb21808e-24a7-4f0d-90db-dba9fc8f6bca-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/9b09cab1-9cb5-4986-83c7-bc56ac848180-jpg.webp)
![I 4.1 RCT Ti KX450F 12-15 Anodized FMF Muffler Slip On []](https://boydsassets.specd.nz/uploads/2026/09/8a84fc4b-e63f-4a04-9fe5-cd813030a04c-jpg.webp)




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