SC PROJECT S1-GP EXHAUST FOR KTM DUKE 790-890 (2020-2020)

SC PROJECT S1-GP EXHAUST FOR KTM DUKE 790-890 (2020-2020)

The KTM Duke 790 and 890 are known for their /sc-project-s1-gp…-duke-7902018-20/ aggressive styling, lightweight chassis, and razor-sharp performance. Both machines deliver exceptional handling and mid-range torque that place them among the top contenders in the middleweight naked category. But even motorcycles with this kind of pedigree have room for improvement—and that’s exactly where the SC Project S1-GP Exhaust enters the picture.

Inspired by the world of MotoGP, the S1-GP slip-on exhaust brings serious racing aesthetics and performance to the street. It’s built for riders who want to transform their Duke’s sound, shed weight, and unlock smoother power delivery. Whether you’re pushing your limits at the track or carving through twisties on the weekend, the S1-GP adds a visceral new dimension to your ride.

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Race-Bred Design

The S1-GP is not just another aftermarket exhaust—it’s a high-performance system developed with racing DNA at its core. SC Project, based in Italy, is a world-renowned name in professional motorsports, providing exhaust systems for teams in MotoGP, WorldSBK, and Moto2. This experience directly influences every product they make, and the S1-GP is no exception.

This exhaust is constructed from lightweight, heat-resistant titanium and features a short, conical design that mimics the look and function of top-tier racing systems. Its compact profile tucks neatly under the bike, emphasizing the minimalist and aggressive lines of the Duke 790 and 890.

The race-style mesh end cap and visible welds give it an industrial, no-nonsense appearance that visually separates it from more generic slip-ons. It’s not just a performance mod—it’s a design statement.

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Noticeable Performance Gains

The S1-GP improves more than just the look of your Duke. It plays a big role in enhancing the overall performance of the bike. By reducing backpressure and allowing exhaust gases to exit more efficiently, the system helps the engine breathe better. The result? Faster throttle response, better mid-range torque, and smoother power delivery.

While exact horsepower gains can vary depending on whether it’s used with a remapped ECU or high-flow air filter, most riders report a noticeable improvement in acceleration and throttle precision. Even without any engine tuning, the Duke becomes more responsive and lively, especially during aggressive riding or quick gear shifts.

If you’re looking to optimize your bike’s power curve without doing a full system swap or opening the engine, the S1-GP delivers solid gains with minimal effort.

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Aggressive Sound Profile

One of the biggest transformations the SC Project S1-GP brings to the table is sound. The factory exhaust on the Duke is functional but somewhat muted. The S1-GP changes that entirely.

At idle, the exhaust note is deep and growly—confident without being obnoxious. As the revs climb, the tone sharpens into an exhilarating, raspy bark that screams MotoGP inspiration. On deceleration, you get satisfying pops and crackles that make downshifting feel even more rewarding.

It’s the kind of soundtrack that turns heads and elevates the emotional connection between rider and machine. However, it is on the louder side—especially without the optional dB killer. This system may not be suitable for all urban environments or places with strict sound regulations, but for enthusiasts who crave that raw, race-inspired noise, it’s music to the ears.

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Build Quality and Installation

The SC Project S1-GP is built to incredibly high standards. It features TIG-welded seams, CNC-machined brackets, and premium materials throughout. The titanium construction ensures that it’s both lightweight and extremely durable—capable of withstanding high temperatures and the rigors of aggressive riding.

Installation is refreshingly simple. As a slip-on system, it requires no cutting or major modifications to your bike. Most riders can complete the installation at home in under an hour using basic tools. Once installed, the exhaust sits perfectly aligned with the rear of the bike and integrates seamlessly with the factory design.

Its compact, low-profile placement also improves weight distribution and lowers the bike’s center of gravity slightly, making for a more planted and agile feel in tight corners or during rapid direction changes.

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Weight Reduction and Handling Benefits

The stock exhaust on both the 790 and 890 Dukes includes a bulky muffler and catalytic converter. By replacing it with the S1-GP, you’re eliminating several kilos of unnecessary weight. That might not sound like much on paper, but it’s absolutely noticeable when you’re pushing the bike through corners.

Lighter weight equals better handling, faster acceleration, and improved braking—all critical elements for riders who enjoy performance riding or track days. The S1-GP allows your Duke to feel even more nimble and responsive than it already is.

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Street Legality and Optional Components

As a performance-focused exhaust, the S1-GP may not be street-legal in some regions due to sound and emissions regulations. It does not include a catalytic converter, and the sound level without a dB killer is quite pronounced.

SC Project offers optional dB killers for noise reduction, and in some markets, homologated variants are available. Be sure to check your local laws before installing this system on a street-registered motorcycle.

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Final Thoughts

The SC Project S1-GP Exhaust for KTM Duke 790–890 (2020) is a premium slip-on system that delivers in every category—performance, sound, weight, and design. It transforms the bike’s character with MotoGP-inspired sound and styling while offering practical gains in power delivery and handling.

It’s an ideal choice for riders who want to elevate their bike’s capabilities without going all-in on a full exhaust system. Lightweight, aggressive, and built to perform, the S1-GP turns your KTM Duke into an even sharper weapon—on the road or at the track.