SP Concepts

SP Concepts Exhaust Systems for Harley-Davidson

SP Concepts manufactures American-made performance exhaust systems for Harley-Davidson motorcycles, combining hand-TIG-welded stainless steel construction with distinctive styling and a range of exhaust designs. From Milwaukee-Eight Softail and Touring motorcycles to Dyna, FXR, and Sportster builds, SP Concepts offers exhaust options for riders seeking an aggressive sound, performance-oriented design, and high-quality craftsmanship.

At Get Lowered Cycles, we carry SP Concepts LaneSplitter, Big Bore 4.5, Cutback, Elsinore, and Turnpike exhaust systems, along with select Works Edition configurations and accessories. Whether you're upgrading a Low Rider S, Low Rider ST, Road Glide, Street Glide, or building a custom Harley, choosing the right SP Concepts exhaust depends on your engine setup, preferred sound, riding style, and motorcycle fitment.

SP Concepts LaneSplitter 2-Into-1 Exhaust

The SP Concepts LaneSplitter is one of the brand's signature exhaust systems. Designed with stepped stainless steel headers and a 4-inch muffler body, the LaneSplitter delivers an aggressive exhaust tone with a distinctive rolled-cone muffler design.

The system features stepped headers transitioning from 1-3/4 inches to 1-7/8 inches and then 2 inches at the collector. Its 2-1/4-inch perforated baffle produces a deep sound with a more pronounced rasp than the Big Bore system, according to SP Concepts.

LaneSplitter exhaust systems are available for multiple Harley-Davidson platforms, including Milwaukee-Eight Softail, Touring, Dyna, FXR, and select Sportster models.

Explore the SP Concepts LaneSplitter Exhaust for 2018-2026 Harley Softail or the LaneSplitter Exhaust for 2017-2026 Harley Touring.

SP Concepts Big Bore 4.5 Exhaust

The SP Concepts Big Bore 4.5 is designed for riders seeking a deeper exhaust tone and a system suited to both stock and modified Harley-Davidson engines.

Unlike the LaneSplitter's 4-inch muffler, the Big Bore features a larger 4.5-inch muffler body with a stepped internal baffle transitioning from 2-1/4 inches to 2-1/2 inches. It also incorporates a reversion chamber after the collector.

According to SP Concepts, this combination emphasizes usable low- to midrange torque while retaining the exhaust flow required for larger performance engine builds. The Big Bore produces a deep, throaty tone with less rasp than the LaneSplitter.

For Milwaukee-Eight applications, check out the SP Concepts Big Bore 4.5 Exhaust for 2018-2026 Harley Softail and the Big Bore Exhaust for 2017-2026 Harley Touring.

SP Concepts LaneSplitter vs. Big Bore: Which Is Better?

Choosing between the SP Concepts LaneSplitter and Big Bore comes down to your preferred exhaust sound, engine modifications, and intended riding characteristics.

• LaneSplitter: A 4-inch muffler design with a 2-1/4-inch perforated baffle. Generally the louder, raspier option of the two, with a compact appearance and strong performance potential on compatible stock and modified motorcycles.
• Big Bore 4.5: A larger muffler design featuring a stepped baffle and reversion chamber. Produces a deeper, throatier sound and is particularly appealing for riders building larger-displacement performance engines.
• Sound: Both produce an aggressive exhaust note, but the LaneSplitter is generally more pronounced and raspy, while the Big Bore emphasizes a deeper tone.
• Performance: Both are performance-oriented designs. Actual horsepower and torque results depend on engine displacement, camshaft, cylinder heads, tuning, and other modifications.

For a stock or mildly modified Harley, either system may be a good choice. For a larger performance build focused on strong low- and midrange response, the Big Bore deserves particular consideration.

SP Concepts Cutback Exhaust

The SP Concepts Cutback delivers the brand's performance-oriented construction in a shorter, more aggressive exhaust configuration.

Featuring stepped stainless steel headers, a 4-inch rolled-cone muffler, and a CNC-machined billet aluminum slash-style end cap, the Cutback offers distinctive styling for Harley-Davidson performance builds.

Cutback exhaust systems are available for select Softail, Touring, Dyna, FXR, and Sportster applications. Specific mounting configurations and clearances vary by motorcycle.

Browse the SP Concepts Cutback Exhaust for 2018-2026 Harley Softail or the Cutback Exhaust for 2017-2026 Harley Touring.

SP Concepts Elsinore Mid-Length Exhaust

The SP Concepts Elsinore is a mid-length performance exhaust system designed for compatible Milwaukee-Eight Softail and Harley-Davidson Touring motorcycles.

The Elsinore combines stepped stainless steel head pipes with a performance-oriented muffler configuration and a distinctive mid-length appearance. It provides another option for riders looking beyond the shorter LaneSplitter and Cutback exhaust designs.

Available in multiple finishes and select Works Edition configurations, the Elsinore is well suited for custom Harley builds where exhaust appearance, ground clearance, riding style, and engine performance are important considerations.

Explore the SP Concepts Elsinore Exhaust for 2018-2026 Harley Softail or the Elsinore Exhaust for 2017-2026 Harley Touring.

SP Concepts Turnpike Full-Length Exhaust

For Harley-Davidson Touring riders seeking a full-length exhaust configuration, SP Concepts offers the Turnpike system.

The Turnpike combines the brand's stainless steel construction and stepped-header design with a longer exhaust layout. It is available in standard and Works Edition configurations for compatible Touring motorcycles.

This system is worth considering for Street Glide, Road Glide, and Road King builds where the appearance of a full-length exhaust is preferred over a compact, shorter system.

View the SP Concepts Full-Length Turnpike Exhaust for 2017-2026 Harley Touring.

SP Concepts Works Edition & Pro Flo Headers

SP Concepts offers premium Works Edition exhaust systems featuring individually fabricated, pie-cut stainless steel sections joined with precision TIG welding. These systems combine performance-oriented exhaust designs with distinctive custom craftsmanship.

For select compatible exhaust systems, SP Concepts also offers optional Pro Flo header configurations. These incorporate additional chambers engineered to influence exhaust gas behavior and improve performance characteristics.

Actual results vary depending on engine setup and tuning. Pro Flo header options are system-specific and should not be assumed interchangeable across different exhaust models.

Explore the SP Concepts Works Edition Big Bore Exhaust for Harley Touring.

SP Concepts Exhaust Fitment for Harley-Davidson

SP Concepts offers exhaust systems for multiple Harley-Davidson generations. Before ordering, confirm your exact model, year, engine platform, and exhaust configuration.

Milwaukee-Eight Softail: Select systems are available for 2018-2026 M8 Softail applications, including compatible Low Rider S and Low Rider ST motorcycles. Certain models, such as Fat Boy and Breakout, may have additional restrictions depending on the specific exhaust.

Harley-Davidson Touring: SP Concepts manufactures exhaust systems for Milwaukee-Eight Touring motorcycles as well as earlier Twin Cam Touring applications. Always verify compatibility with newer 2024-up chassis, engine covers, CVO configurations, and other model-specific changes.

Harley Dyna: SP Concepts offers application-specific exhaust systems for older and newer Dyna generations. Mounting and fitment differ by model year.

Harley FXR & Sportster: Select LaneSplitter, Cutback, and Big Bore configurations are offered for compatible older Harley platforms. Availability and fitment vary by product.

SP Concepts Exhaust Performance, Sound & Tuning

Replacing a factory exhaust with an aftermarket performance system can change exhaust flow, sound, and engine operating characteristics. However, an exhaust alone does not guarantee a specific horsepower or torque increase.

Results depend on the motorcycle's engine displacement, compression ratio, camshaft, intake system, exhaust configuration, and calibration. Larger engines and performance camshaft combinations may respond differently to exhaust designs than a stock engine.

When selecting an SP Concepts exhaust, consider the intended RPM range and riding style rather than choosing solely by muffler diameter or appearance. An appropriate engine calibration may be necessary following installation, depending on the motorcycle and modifications.

Also review each product's emissions notice. Some aftermarket exhaust configurations are not legal for sale or use on emissions-controlled motorcycles in certain jurisdictions.

Frequently Asked Questions About SP Concepts Exhaust

Which is louder, the SP Concepts LaneSplitter or Big Bore?

According to SP Concepts, the LaneSplitter generally produces a louder, raspier sound. The Big Bore offers a deeper, throatier exhaust tone. Actual sound varies by motorcycle, engine configuration, and operating conditions.

Is the SP Concepts Big Bore good for a built Milwaukee-Eight engine?

The Big Bore is designed to accommodate a range of engine configurations, including larger performance builds. Its stepped baffle and reversion chamber are intended to support usable power delivery. Choosing the best exhaust for a particular build should also account for camshaft selection, engine displacement, and tuning.

Does SP Concepts make exhausts for the Harley Low Rider S and Low Rider ST?

Yes. SP Concepts offers compatible exhaust systems for select Milwaukee-Eight Softail models, including Low Rider S and Low Rider ST applications. Verify the specific product configuration and exact model year before ordering.

What is the difference between SP Concepts standard and Works Edition exhaust?

Works Edition systems feature a more elaborate pie-cut construction and extensive hand TIG welding. They offer a distinctive premium appearance while retaining the underlying exhaust design's performance-oriented characteristics.

Does an SP Concepts exhaust require tuning?

Tuning requirements depend on the motorcycle, exhaust configuration, engine modifications, and applicable emissions regulations. Consult a qualified tuner to determine the appropriate calibration for your setup.

Are SP Concepts exhaust systems made in the USA?

Yes. SP Concepts manufactures its exhaust systems in the United States and is known for its hand-TIG-welded stainless steel construction.

Shop SP Concepts Exhaust at Get Lowered Cycles

Get Lowered Cycles carries SP Concepts performance exhaust systems for Harley-Davidson motorcycles, including LaneSplitter, Big Bore, Cutback, Elsinore, Turnpike, and Works Edition configurations.

Whether you're building a Low Rider S, upgrading a performance bagger, or customizing a Dyna or FXR, explore the available SP Concepts products above to compare finishes, designs, and motorcycle compatibility.

You can also browse our complete selection of Harley-Davidson Softail exhaust systems to compare additional manufacturers and configurations.

Get Lowered Cycles offers free U.S. shipping with no order minimum. If you need help choosing an exhaust system for your Harley-Davidson, our team can assist with product fitment and compatibility questions.