Cobra 909 Slip-On Mufflers For Harley Trike 2009-2025

Cobra 909 Slip-Ons: A New Voice for the Harley-Davidson Trike

The Cobra 909 Slip-On Mufflers for 2009-2025 Harley-Davidson Trike models—including the Tri Glide Ultra and the Freewheeler—are the definitive solution for riders who find the factory exhaust too quiet and “reedy.” Trikes present a unique challenge for exhaust manufacturers due to the restricted space beneath the rear bodywork and the proximity to the fiberglass trunk. Cobra has engineered the 909 series to provide a massive 4-inch diameter profile that fills out the rear exhaust cutouts perfectly while ensuring there is plenty of clearance for the independent rear suspension. Whether you are running a Twin Cam 103 or a Milwaukee-Eight 114/117, these slip-ons provide the deep, authoritative soundtrack that the heavy-duty trike chassis deserves.

Superior Acoustics and High-Flow Engineering

What sets the Cobra 909 apart is its internal architecture. While many slip-ons can sound “tinny” on a trike due to the long distance the exhaust must travel, the 909 uses 2.25-inch constant-velocity cores. These cores are wrapped in a combination of stainless steel mesh and high-density bonded e-glass. This “absorption-style” baffle targets high-frequency raspy noises and cancels them out, leaving only the low-frequency “thumping” sounds. The result is an exhaust that is deep and muscular at idle but transitions into a smooth, non-fatiguing growl at highway speeds. This makes it ideal for Tri Glide owners who enjoy using their on-board audio systems, as the exhaust frequency doesn’t “fight” with the music.

Expert Tuning & Maintenance Advice

As specialists in the Harley-Davidson Trike platform, we know that these machines generate significant heat due to the added weight and wind resistance of the third wheel. Pro Tip: While these are “slip-on” mufflers and can technically be used with the factory fuel map, we highly recommend a fuel tuner like the Vance & Hines Fuelpak FP4 for 2017-2025 M8 models. This will richen the air-fuel mixture, helping the engine run cooler and eliminating the deceleration “popping” often heard with high-flow mufflers. Aesthetic Note: Because the exhaust tips sit near the rear of the bodywork, road grime can accumulate quickly. We recommend cleaning your Chrome or Raven Black tips regularly with a non-abrasive cleaner to prevent road salts or oils from etching into the finish.

Custom Look with American Quality

The 909 series is finished with race-inspired scalloped end caps that provide a custom-shop look without the custom-shop price tag. Every Cobra system is 100% Made in the USA, ensuring that the chrome plating and internal welds are built to withstand the rigors of long-distance touring. For the Trike owner who wants a more aggressive stance, better throttle response, and a legendary V-Twin rumble, the Cobra 909 Slip-On Mufflers are the best-in-class choice.

Fitment Note: Fits all 2009-2025 Trike models. Not compatible with 2-wheel Touring models. Re-uses factory head pipe clamps.

Cobra 909 Slip-On Mufflers For Harley Trike

Want that classic Harley rumble without dropping months’ worth of bike payments? The Cobra 4″ 909 Twins Slip-On Mufflers feature a scalloped and smooth-rolled outer tip matched by a scalloped inner tip. That inner tip is part of the constant velocity, spiral-louvered cores that give these mufflers their great performance and the deep, throaty, instantly recognizable sound you expect from your Harley-Davidson Touring motorcycle. There are also no visible outer screws, providing a sleek, stylish look.

Features:

• Machined radial slash cut aluminum tips step up to the body allowing ground clearance
• Construction of muffler is protected by a fiberglass wrap
• Provides outstanding performance with a deep thundering bass note
• Performance and sound of a large bodied muffler with far less worry about scraping