Dirt Bike 4-Stroke Mufflers
Upgrade to 4-stroke mufflers engineered for maximum efficiency and sound control. These high-performance components enhance power delivery while delivering a smoother, quieter ride. Perfect for competitive racing or casual trail rides, our dirt bike 4-stroke mufflers ensure top-tier performance with lasting durability.
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Pro Circuit T-4 Slip-On Silencer 2003 KTM 525 SX 4T00400
PRO CIRCUIT
$523.95Stock silencers rob your 525 SX of its potential—the Pro Circuit T-4 slip-on delivers measurable horsepower and torque gains across the entire power band, transforming throttle response and acceleration. Built from lightweight aluminum and stainless...4T00400- SKU:
- 4T00400
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- PRODUCT NAME:
- SILENCER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
- STYLE:
- ROUND
- FEATURES:
- WITH SPARK ARRESTOR
- MODEL:
- T-4
- PIPE MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- MUFFLER COLOR/FINISH:
- POLISHED
$523.95 -
Pro Circuit T-4 Silencer Honda XR400R 1996-2004 4H00400
PRO CIRCUIT
$523.95The Pro Circuit T-4 Silencer unlocks measurable gains in horsepower and torque across your XR400R's entire powerband while keeping weight to a minimum. If you're running stock exhaust, you're leaving performance on the table—this bolt-on silencer is...4H00400- SKU:
- 4H00400
- Availability:
- Ships Same Business Day
- Weight:
- 5.13 LBS
$523.95 -
Pro Circuit T-4 Slip-On Exhaust Honda XR650L 1993-2024 4H85600
PRO CIRCUIT
$523.95The Pro Circuit T-4 slip-on exhaust unlocks measurable horsepower and torque gains across your XR650L's entire power band, translating to quicker acceleration and more responsive throttle control on trail and track. By reducing backpressure through...4H85600- SKU:
- 4H85600
- Availability:
- Ships Same Business Day
- Weight:
- 9.00 LBS
$523.95 -
Pro Circuit T-6 Slip-On Silencer for Kawasaki KX250F 2017-2019 0121725A
PRO CIRCUIT
$649.95If you're running a KX250F, stock exhaust is costing you power and throttle response. The Pro Circuit T-6 Slip-On Silencer delivers measurable performance gains through optimized flow dynamics while keeping your bike street-legal with a removable spark...18211783- SKU:
- 18211783
- Availability:
- Ships Same Business Day
- Weight:
- 10.30 LBS
- END CAP MATERIAL:
- STAINLESS STEEL
- MODEL:
- T-6
- MUFFLER MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- SILENCER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
$649.95 -
Pro Circuit T-6 Slip-On Silencer KTM 350 SX-F 2016-2018 0151635A
PRO CIRCUIT
$649.95If you're running a 350 SX-F and want measurable gains in throttle response and mid-range power, a quality slip-on silencer is one of the most cost-effective upgrades available. The Pro Circuit T-6 delivers the performance you need without requiring...18211729- SKU:
- 18211729
- Availability:
- Ships Same Business Day
- Weight:
- 8.60 LBS
- PRODUCT NAME:
- SILENCER
- MODEL:
- T-6
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
$649.95 -
Pro Circuit T-6 Muffler for 2018 KTM 450SXF 0151545A
PRO CIRCUIT
$649.95The Pro Circuit T-6 Muffler delivers measurable power gains and a refined exhaust note for your 2018 KTM 450SXF while maintaining the reliability you need in competition or trail conditions. This slip-on design combines lightweight construction with...18211699- SKU:
- 18211699
- Availability:
- Ships Same Business Day
- Weight:
- 9.00 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
- MODEL:
- T-6
- PRODUCT NAME:
- SILENCER
- UNITS:
- EACH
$649.95 -
Pro Circuit T-6 Slip-On Silencer for Yamaha YZ450F 2018-2019 0131845A
PRO CIRCUIT
$799.95The Pro Circuit T-6 slip-on silencer delivers measurable gains in exhaust scavenging and mid-range power for your YZ450F while maintaining stock headpipe compatibility—no custom fabrication required. If you're running your YZ450F hard in competition or...18211841- SKU:
- 18211841
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- END CAP MATERIAL:
- STAINLESS STEEL
- MODEL:
- T-6
- MUFFLER MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- SILENCER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
$799.95 -
Pro Circuit T-6 Slip-On Silencer Yamaha YZ250F 2019-2025 0131925A
PRO CIRCUIT
$799.95The Pro Circuit T-6 slip-on silencer delivers measurable gains in power and throttle response while keeping weight to a minimum—critical for YZ250F riders who demand performance without compromise. Its asymmetrical internal design increases packing...18211893- SKU:
- 18211893
- Availability:
- Ships Same Business Day
- Weight:
- 11.60 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- MUFFLER MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- SILENCER
- END CAP MATERIAL:
- STAINLESS STEEL
- MODEL:
- T-6
- UNITS:
- EACH
$799.95 -
Pro Circuit T-6 Slip-On Silencer KTM 450 SX-F 2019-2022 0151845A
PRO CIRCUIT
$649.95The Pro Circuit T-6 slip-on silencer delivers measurable gains in power and throttle response while significantly reducing backpressure—a direct result of its asymmetrical design and optimized packing volume. If you're running a 450 SX-F and want bolt-on...18211878- SKU:
- 18211878
- Availability:
- Ships Same Business Day
- Weight:
- 9.20 LBS
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- PRODUCT NAME:
- SILENCER
- UNITS:
- EACH
- MODEL:
- T-6
$649.95 -
Pro Circuit T-6 Slip-On Exhaust Honda CRF250R 2018-2019 0111825A2
PRO CIRCUIT
$1,045.95If you're running a CRF250R in competition or on the trail, your exhaust system directly impacts power delivery and throttle response. The Pro Circuit T-6 slip-on delivers measurable performance gains without requiring extensive modification—bolt it on...18211860- SKU:
- 18211860
- Availability:
- Ships Same Business Day
- Weight:
- 17.40 LBS
- PRODUCT NAME:
- SILENCER
- MODEL:
- T-6
- UNITS:
- EACH
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
$1,045.95 -
Pro Circuit T-6 Slip-On Exhaust Kawasaki KX450F 2019-2022 0121945A
PRO CIRCUIT
$799.95The Pro Circuit T-6 Slip-On delivers measurable gains in power delivery and throttle response while keeping weight minimal—critical advantages whether you're chasing lap times or tackling technical terrain. Its stainless steel construction and...18211891- SKU:
- 18211891
- Availability:
- Ships Same Business Day
- Weight:
- 10.20 LBS
- MODEL:
- T-6
- UNITS:
- EACH
- PRODUCT NAME:
- SILENCER
- END CAP MATERIAL:
- STAINLESS STEEL
- MUFFLER MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
$799.95 -
Pro Circuit T-6 Slip-On Silencer Kawasaki KX250F 2021-2024 0122125A
PRO CIRCUIT
$779.95The Pro Circuit T-6 slip-on silencer unlocks measurable performance gains on your KX250F while delivering the durability needed for both trail and competition use. A properly tuned exhaust system reduces backpressure, improves throttle response, and...18212030- SKU:
- 18212030
- Availability:
- Ships Same Business Day
- Weight:
- 9.90 LBS
- TYPE:
- SLIP-ON
- COLOR/FINISH:
- STAINLESS STEEL
- MODEL:
- T-6
- UNITS:
- EACH
- PRODUCT NAME:
- MUFFLER
- RIDING STYLE:
- OFF-ROAD
$779.95 -
FMF Factory 4.1 RCT Muffler - Aluminum 042290
FMF
$599.99If you're serious about extracting maximum power while reducing unsprung weight, the FMF Factory 4.1 RCT delivers measurable gains across the entire RPM band without compromise. The Resonance Chamber Technology™ and optimized mass centralization give you...18211391- SKU:
- 18211391
- Availability:
- Ships Same Business Day
- Weight:
- 8.83 LBS
- PIPE MATERIAL:
- STAINLESS STEEL
- END CAP MATERIAL:
- CARBON FIBER
- MUFFLER MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- MUFFLER
- UNITS:
- EACH
- MODEL:
- FACTORY 4.1 RCT
- MUFFLER COLOR/FINISH:
- RAW
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
$599.99 -
FMF Factory 4.1 RCT Muffler - Aluminum 042291
FMF
$599.99If you're serious about extracting maximum power from your engine while reducing weight and minimizing crash vulnerability, the FMF Factory 4.1 RCT delivers measurable gains across the entire RPM range. By centralizing mass through Factory Forward...18211392- SKU:
- 18211392
- Availability:
- Ships Same Business Day
- Weight:
- 8.72 LBS
- PIPE MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- MUFFLER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- MODEL:
- FACTORY 4.1 RCT
- MUFFLER COLOR/FINISH:
- RAW
- MUFFLER MATERIAL:
- ALUMINUM
- END CAP MATERIAL:
- CARBON FIBER
- UNITS:
- EACH
$599.99 -
FMF Factory 4.1 RCT Muffler - Aluminum 042292
FMF
$599.99If you're serious about extracting maximum performance from your bike while reducing weight and minimizing crash damage risk, the FMF Factory 4.1 RCT delivers measurable gains across the entire RPM range. FMF's Resonance Chamber Technology™ optimizes...18211393- SKU:
- 18211393
- Availability:
- Ships Same Business Day
- Weight:
- 8.74 LBS
- PIPE MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- MUFFLER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- MUFFLER COLOR/FINISH:
- RAW
- MUFFLER MATERIAL:
- ALUMINUM
- END CAP MATERIAL:
- CARBON FIBER
- UNITS:
- EACH
- MODEL:
- FACTORY 4.1 RCT
$599.99Qty in Cart: 0Quantity:Price:$599.99Subtotal: -
FMF Q4 Muffler 043380
FMF
$449.99The FMF Q4 Muffler delivers the optimal balance of aggressive sound and real-world performance gains by reducing back pressure while maintaining street legality. If you're running a high-revving engine that demands efficient exhaust flow without...18212045- SKU:
- 18212045
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- END CAP STYLE:
- SLASH-CUT
- PRODUCT NAME:
- MUFFLER
- MATERIAL:
- ALUMINUM
- MODEL:
- Q4 HEX
- RIDING STYLE:
- OFF-ROAD
- END CAP MATERIAL:
- STAINLESS STEEL
- TYPE:
- SLIP-ON
- UNITS:
- EACH
$449.99 -
FMF Factory 4.1 RCT Muffler - Aluminum 044464
FMF
$674.99If you're serious about extracting maximum power from your engine while reducing unsprung weight, the FMF Factory 4.1 RCT Muffler delivers measurable gains across the entire RPM range without compromise. By centralizing mass closer to the motor through...18212012- SKU:
- 18212012
- Availability:
- Ships Same Business Day
- Weight:
- 8.40 LBS
- END CAP MATERIAL:
- CARBON FIBER
- MODEL:
- FACTORY 4.1 RCT
- MUFFLER COLOR/FINISH:
- RAW
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- UNITS:
- EACH
- PRODUCT NAME:
- MUFFLER
- MUFFLER MATERIAL:
- ALUMINUM
- PIPE MATERIAL:
- STAINLESS STEEL
$674.99 -
FMF Factory 4.1 RCT Muffler - Anodized Titanium 044466
FMF
$799.99If you're serious about extracting maximum power from your machine while minimizing unsprung weight, the FMF Factory 4.1 RCT is engineered to deliver across the entire RPM band. Its shorter, centralized design reduces crash vulnerability and lowers your...18212013- SKU:
- 18212013
- Availability:
- Ships Same Business Day
- Weight:
- 8.40 LBS
- END CAP MATERIAL:
- CARBON FIBER
- MODEL:
- FACTORY 4.1 RCT
- MUFFLER COLOR/FINISH:
- ANODIZED BLUE
- PIPE MATERIAL:
- TITANIUM
- TYPE:
- SLIP-ON
- UNITS:
- EACH
- MUFFLER MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- MUFFLER
$799.99 -
FMF Factory 4.1 Muffler 042394
FMF
$599.99The FMF Factory 4.1 Muffler delivers a tuned exhaust note that doesn't sacrifice performance—optimized flow characteristics reduce backpressure while maintaining street-legal sound levels. Whether you're maximizing horsepower on the dyno or simply want a...18212035- SKU:
- 18212035
- Availability:
- Ships Same Business Day
- Weight:
- 7.68 LBS
- PRODUCT NAME:
- MUFFLER
- END CAP STYLE:
- CONICAL
- TYPE:
- SLIP-ON
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- MODEL:
- FACTORY 4.1 RCT
- RIDING STYLE:
- OFF-ROAD
- END CAP COLOR/FINISH:
- BLACK
- END CAP MATERIAL:
- CARBON FIBER
- MATERIAL:
- ALUMINUM
$599.99 -
FMF Factory 4.1 Muffler 042396
FMF
$749.99The FMF Factory 4.1 Muffler delivers the performance exhaust flow your engine demands while maintaining street-legal sound levels. This is the choice of professional racers and serious enthusiasts who refuse to compromise between power gains and...18212036- SKU:
- 18212036
- Availability:
- Ships Same Business Day
- Weight:
- 6.70 LBS
- COLOR/FINISH:
- ANODIZED
- MODEL:
- FACTORY 4.1 RCT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SLIP-ON
- END CAP MATERIAL:
- CARBON FIBER
- END CAP STYLE:
- CONICAL
- PRODUCT NAME:
- MUFFLER
- UNITS:
- EACH
- COLOR/FINISH:
- BLUE
- END CAP COLOR/FINISH:
- SILVER
- MATERIAL:
- TITANIUM
$749.99
