SKU: 21471959928

FMF - Factory 4.1 RCT Complete System (Gas Gas)

Sale price$435.38 Regular price$483.75
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  • CAN

Ships within 48 hours · Estimated delivery Jul 9 - Jul 14

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Description

FMF - Factory 4.1 RCT Complete System (Gas Gas)FMF Factory 4. 1 RCT Complete System (GasGas) The FMF Factory 4. 1 RCT Complete System is built for GasGas riders who want stronger power, a lighter feel, and cleaner throttle response across the entire RPM range. Using FMFs latest Resonance Chamber Technology inside and outside the canister, this system controls sound while improving flow, giving you a noticeable performance boost without excess noise. The shorter muffler design works with FMFs

FMF – Factory 4.1 RCT Complete System (GasGas)

The FMF Factory 4.1 RCT Complete System is built for GasGas riders who want stronger power, a lighter feel, and cleaner throttle response across the entire RPM range. Using FMF’s latest Resonance Chamber Technology inside and outside the canister, this system controls sound while improving flow, giving you a noticeable performance boost without excess noise. The shorter muffler design works with FMF’s Factory Forward Engineering, keeping the weight tucked in tight to the engine for better balance and less chance of damage in a crash. It’s built from aerospace-grade materials and manufactured start-to-finish in FMF’s Southern California facility.

Why We Like It

It gives GasGas four-strokes a more responsive feel without making the bike overly loud. The mass-centralized design makes the bike handle lighter, and the Megabomb header adds smooth, usable power everywhere. The construction is clean, durable, and very “factory”—a top-tier exhaust setup that fits and performs exactly how it should.

Why It’ll Work for You

If you want stronger low-to-top power and a lighter, more balanced feel, this system makes an immediate difference. The patented chamber and canister designs increase flow and manage sound better than a standard slip-on, while the shorter length helps keep your exhaust out of harm’s way. It bolts on easily, works with tuning inserts or a spark arrestor, and is optimized specifically for GasGas engines.

Key Features

  • Latest FMF Resonance Chamber Technology (internal + external)

  • Patented core shape reduces sound while maintaining maximum power

  • Patented canister shape increases internal volume for better sound absorption

  • Patented chamber design refines exhaust pressure and improves flow

  • Factory Forward Engineering for mass centralization and reduced crash damage

  • Application-specific tuned exhaust core

  • Rear endcap accepts tuning inserts or spark arrestor

  • Includes Titanium Megabomb header for optimized power output

  • Carbon fiber end cap

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 21471959928

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4.0 ★★★★★
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St. Paul Girl
Los Angeles, US
★★★★★ 5
what a difference !
Note: there are no English instructions. I wanted this cleaning agent to disperse throughout the nooks and crannies of the engine, so about ten minutes before arriving at the mechanic's shop for my oil change appointment, I pulled the car over and poured this into the engine, then drove it the rest of the way there. The mechanic reported lots of sludge drained out with the oil. The engine seems to perform and sound better, as if it's not working as hard.
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Reviewed in the United States on February 15, 2026
A
Verified Purchase
Andres Moreno
West Palm Beach, US
★★★★★ 4
Buen producto
Buen producto, limpia perfectamente el motor interno y se libera la suciedad en el cambio de aceite. no use todo el contenido, creo que es bueno usarlo en 2 cambios de aceite para una mayor eficiencia.
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Reviewed in the United States on March 29, 2026
L
Verified Purchase
Lee Nunn
West Palm Beach, US
★★★★★ 5
Great will use it over and over again
I will use this in every car I own from now. Cleaned it real well did exactly what it said so and my truck runs a lot better definitely can tell the difference.. it was work the extra oil and work. The bottle I bought came with instructions in English, which made it easy for me. The quality of it is light brake cleaner, but meant for engines and it ran great very easy to use this pour in.
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Reviewed in the United States on October 19, 2025
B
Verified Purchase
Beni
New York, US
★★★★★ 5
Does its job.
Always a go to before oil changes. Helps remove some extra sludge/deposits. DO NOT DRIVE OR REV THE VEHICLE WHEN USNG THE PRODUCT, only idle for 10-15 min. Ive seen reviews where people drove with it potentially ruining the engine.
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Reviewed in the United States on March 26, 2026
A
Verified Purchase
Adan Ichich
Bozeman, US
★★★★★ 5
Calidad de limpieza al motor
Excelente producto, lo llevo usándolo un buen tiempo, en cada cambio de aceite, limpia bien por dentro del motor. Es fácil usarlo, hecharlo donde se llena el aceite del motor, y enciende el motor espere 10 minutos, y apague el motor, y vuelve a esperar 25 o 30 minutos para que se enfríe el motor, ya cumplido lo 25 o 30 minutos sacar el aceite viejo del motor. Listo, producto muy recomendable. Excelente funcionamiento, chevy silverado 2004
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Reviewed in the United States on March 15, 2026

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