SP Concepts Black Onyx Big Bore Pro Flo Installed on a Harley Street Glide

The Black Onyx finish used by SP Concepts is a premium multi stage coating that delivers a deep matte black tone with a smooth, uniform surface. It is designed to resist heat, corrosion, and surface wear while maintaining a rich satin texture that complements modern performance bagger and M8 Softail builds. The finish has a dense, almost graphite like appearance that stays consistent from the headers to the muffler. A proper tune is important to ensure the longevity of the finish.

Gold and bronze weld highlights stand out sharply against the Black Onyx surface, giving the exhaust a custom handcrafted look. The finish also stays clean and low glare, which helps the system blend into the bike while still looking aggressive and purposeful.

When you want a performance focused exhaust that blends aggressive style with real power gains, the SP Concepts Black Onyx Big Bore Exhaust with Pro Flo headers is hard to beat. This system delivers a deep and clean tone, noticeable throttle response improvements, and a finish that stands out on any Harley model. Paired with the right supporting parts, like the S&S Stealth Air Stinger Air Cleaner it transforms the bike into a sharper and more responsive machine.

Clean Styling With an Aggressive Edge

The SP Concepts Big Bore Exhaust is built with a sleek, low profile design that works perfectly on performance bagger builds. In the photos above, you can see how the matte black finish and gold accents complement the the S&S air cleaner and bronze colors on the bike. The stepped header design adds visual depth while also improving exhaust scavenging.

Performance Focused Design

SP Concepts created the Pro Flo system for riders who want more torque and quicker acceleration. The exhaust provides smooth flow from cylinder head to muffler, which helps improve mid range power. It also pairs well with popular upgrades like cams, larger throttle bodies, and high flow intakes. The welded transitions and precision bends shown in the close ups highlight the build quality that sets SP Concepts apart.

Premium Fitment for Harley Touring Models

The Big Bore exhaust fits Harley Touring models nicely and offers solid ground clearance, especially for riders who push their bike through corners. The system also follows clean mounting lines, which helps keep the rear end looking balanced. On this build, the exhaust flows smoothly under the bags and works with the overall stance of the bike.

A Sound That Matches the Look

The Big Bore Pro Flo header combo delivers a deep and controlled tone. Riders who want a strong, performance oriented rumble without excessive harshness will appreciate this system. It has enough bite to stand out in traffic while still offering long ride comfort.

For a quick sound clip and walk around click HERE or the photo below:

Why Riders Choose SP Concepts

• High quality welds and construction
• Improved throttle response and mid range torque
• Clean and aggressive styling for Harley models
• Durable design built for real world riding

If you want a performance exhaust that looks as good as it performs, the SP Concepts Black Onyx Big Bore with Pro Flo headers is a top choice for Harley Touring builds. It delivers the combination of sound, power, and styling that many riders are looking for.

Shop the full lineup of performance exhaust systems and Harley upgrades at GetLowered.com.