New Products
FMF Factory 4.1 Carbon Fiber End Cap - New Style Replacement carbon fiber end cap for current-generation Factory 4.1 RCT mufflers. Applications:... more info
$129.99 $116.99
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FMF Factory 4.1 Red Carbon Fiber End Cap - New Style Red-tinted carbon fiber replacement end cap for Factory 4.1 RCT mufflers. Applications:... more info
$129.99 $116.99
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FMF Factory 4.1 RCT Stainless End Cap Kit Full stainless replacement end cap kit for Factory 4.1 RCT. Easy install. Applications: Universal Factory... more info
$49.99 $44.99
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FMF Factory 4.1 Full System - Stainless/Aluminum CRF450R Stainless/aluminum full system for CRF450R. Durable and powerful for all-day riding.... more info
$1,374.99 $1,237.49
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FMF Factory 4.1 RCT Slip-On Muffler - Aluminum 500 EXC-F Aluminum Factory 4.1 for KTM 500 EXC-F. Enduro power with low noise. Applications: 2023-2025... more info
$1,174.99 $1,057.49
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FMF Factory 4.1 RCT Slip-On Muffler - Blue Anodized Titanium w/ Stainless End Cap Blue anodized titanium slip-on with stainless end cap. Same RCT... more info
$899.99 $809.99
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FMF Factory 4.1 RCT Full System - Stainless/Aluminum w/ Carbon End Cap + Megabomb Header Complete stainless steel system with titanium Megabomb... more info
$674.99 $607.49
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FMF Factory 4.1 Slip-On Muffler - Stainless/Aluminum CRF450R Stainless/aluminum Factory 4.1 slip-on for CRF450R. Reliable performance upgrade.... more info
$299.99 $269.99
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FMF Factory 4.1 Slip-On Muffler - Titanium CRF250R Titanium Factory 4.1 for CRF250R. Weight savings for agile handling. Applications: 2018-2025 Honda... more info
$299.99 $269.99
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FMF Factory 4.1 Mini Slip-On Muffler - Stainless/Aluminum Kid-sized version of the legendary Factory 4.1 RCT. Same patented resonance chamber... more info
$299.99 $269.99
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FMF Factory 4.1 Mini Slip-On Muffler - Stainless/Aluminum w/ Stainless Header Compact version of the Factory 4.1 with stainless header and aluminum... more info
$409.99 $368.99
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FMF Factory 4.1 Slip-On Muffler - Aluminum CRF250R Aluminum Factory 4.1 slip-on for CRF250R. Affordable power boost. Applications: 2018-2025 Honda... more info
$349.99 $314.99
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FMF Factory 4.1 Mini Slip-On Muffler - Stainless/Aluminum KX112 Mini Factory 4.1 for KX112. Compact design with big power for young riders.... more info
$349.99 $314.99
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FMF Factory 4.1 Mini Slip-On Muffler - Blue Anodized Titanium w/ Stainless Header Top-of-the-line mini slip-on with blue anodized titanium canister... more info
$459.99 $413.99
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FMF Factory 4.1 RCT Full System - Aluminum w/ Carbon End Cap + Titanium Megabomb Header Aluminum muffler with carbon end cap paired with titanium... more info
$1,049.99 $944.99
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FMF Factory 4.1 RCT Slip-On Muffler - Titanium 500 EXC-F Titanium Factory 4.1 for KTM 500 EXC-F. Lightweight enduro upgrade. Applications: 2023-2025... more info
$1,074.99 $967.49
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FMF Factory 4.1 RCT Slip-On Muffler - Aluminum 350 SX-F Aluminum Factory 4.1 RCT for KTM 350 SX-F. Balanced power for motocross. Applications:... more info
$1,329.99 $1,196.99
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FMF Factory 4.1 RCT Full System - Titanium 500 EXC-F Full titanium system for KTM 500 EXC-F. Complete torque boost. Applications: 2023-2025 KTM 500... more info
$1,174.99 $1,057.49
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FMF Factory 4.1 RCT Slip-On Muffler - Titanium CRF450R Titanium Factory 4.1 for CRF450R. Premium materials for race-level weight reduction.... more info
$999.99 $899.99
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FMF Factory 4.1 RCT Full System - Stainless/Aluminum w/ Carbon End Cap + Megabomb Best-selling full system for the KX450F. Stainless muffler with... more info
$599.99 $539.99
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