FMF Factory 4.1 RCT Titanium Slip-On
MSRP: $599.99
$479.99
Exact Fitment Guarantee
The FMF Factory 4.1 RCT Titanium Slip-On Silencer is a premier competition exhaust upgrade engineered to replace heavy, restrictive OEM four-stroke mufflers with an ultralight, race-calibrated sound and power solution. Incorporating FMF's patented Resonance Chamber Technology (RCT), the internal core geometry reduces sound output while optimizing pressure waves to expand power output across the entire RPM range. By positioning the internal core closer to the engine and utilizing an aggressive series of internal orifices, the 4.1 RCT shortens overall canister length, concentrating exhaust mass closer to the motorcycle's center of gravity for improved chassis handling in corners.
Constructed from aerospace-grade American titanium, the silencer canister and mid-pipe provide exceptional heat dissipation and significant weight savings compared to stock aluminum-and-steel assemblies. The end cap is crafted from high-temperature carbon fiber with titanium fastening hardware. On the track, riders experience crisp, immediate throttle response at low RPM, stronger mid-range pull out of tight berms, and broad top-end over-rev that eliminates the early power drop-off common to corked-up OEM mufflers. The Factory 4.1 RCT features FMF's Rapid Tuning System (RTS), enabling quick installation of quiet insert screens or USFS-approved spark arrestor screens via a single end cap retaining bolt.
- Canister Material: Aerospace-grade American titanium alloy
- End Cap: High-temperature multi-layer carbon fiber with titanium rivets
- Mid-Pipe: Precision mandrel-bent titanium with CNC machined slip-joint collar
- Internal Core: Stepped stainless steel perforated core with Resonance Chamber Technology (RCT)
- Included Inserts: Removable 94dB sound insert and USFS-approved spark arrestor screen
### Step-by-Step Installation & Safety Protocols Installation connects directly to the OEM header or matching FMF Megabomb header. Begin by removing the side number plate and loosening the mid-pipe clamp. Remove the subframe mounting bolts and pull the stock muffler away. Clean the header outlet pipe of old gasket material. Apply a thin film of high-temperature copper RTV silicone to the slip-fit joint if necessary, slide the FMF titanium mid-pipe over the header outlet, and loosely install the subframe mounting bolts with the provided rubber vibration isolators. Align the canister so it clears the rear brake caliper and swingarm through full suspension compression, then tighten the clamp and subframe bolts to 18-22 Nm. Reinstall the plastic side panel, ensuring at least 15mm clearance to prevent heat melting.
### Maintenance & Service Intervals Maintenance involves periodically inspecting the titanium canister and repacking the internal fiberglass cartridge every 20-30 engine hours. As exhaust packing burns away, sound levels increase and internal heat can discolor or damage the titanium shell. Clean the raw titanium with contact cleaner or WD-40 when cool; never use abrasive scouring pads on titanium surfaces.
Frequently Asked Questions
Q: Does the FMF Factory 4.1 RCT slip-on fit the stock OEM header?
A: Yes, FMF designs the Factory 4.1 RCT slip-on to connect seamlessly with either the factory OEM header pipe or an aftermarket FMF Megabomb/Powerbomb header.
Q: How often should I repack the FMF silencer?
A: FMF recommends inspecting and repacking four-stroke silencers every 20 to 30 operating hours to maintain optimal backpressure, preserve sound compliance, and prevent excessive heat buildup on the canister wall.
Q: Is a spark arrestor included with the 4.1 RCT Titanium Slip-On?
A: The Factory 4.1 RCT comes with a removable USFS-approved spark arrestor screen insert and a sound-dampening quiet insert that can be swapped using basic hand tools.
Q: What is the weight reduction compared to stock?
A: Depending on the specific motorcycle model, the FMF Factory 4.1 RCT Titanium Slip-On typically saves between 1.5 and 2.5 pounds over heavy stock OEM steel-and-aluminum silencer assemblies.