FMF Factory 4.1 Stainless Slip-On Exhaust KTM/HUS 250-501 (’16-’19) | 045594
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 FMF 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 FMF exacting specifications and is manufactured 100% at their 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.
Fitment:
| Year | Model | Make |
| 16-18 | FC250 | HUSQVARNA |
| 16-18 | FC350 | HUSQVARNA |
| 16-18 | FC450 | HUSQVARNA |
| 17-19 | FE250 | HUSQVARNA |
| 17-19 | FE350 | HUSQVARNA |
| 17-19 | FE450 | HUSQVARNA |
| 17-19 | FE501 | HUSQVARNA |
| 17-18 | FX350 | HUSQVARNA |
| 17-18 | FX450 | HUSQVARNA |
| 17-19 | 250 EXC-F | KTM |
| 16-18 | 250 SX-F | KTM |
| 15-17 | 250 SX-F FACTORY EDITION | KTM |
| 16-18 | 250 XC-F | KTM |
| 17-19 | 350 EXC-F | KTM |
| 16-18 | 350 SX-F | KTM |
| 16-18 | 350 XC-F | KTM |
| 18-19 | 450 EXC-F | KTM |
| 17-19 | 450 EXC-F SIX DAYS | KTM |
| 16-18 | 450 SX-F | KTM |
| 15-17 | 450 SX-F FACTORY EDITION | KTM |
| 16-18 | 450 XC-F | KTM |
| 17-19 | 500 EXC-F | KTM |
