Cobra 909-Twins 4" Black Slip-On Mufflers - Harley Softail Fat Boy
About Cobra
Cobra USA builds exhaust, sissy bars, luggage racks and bolt-on styling parts for cruisers and baggers, with a catalog aimed at the rider who wants a finished, matched look rather than a one-off fabrication. Its slip-ons and full systems are designed around factory mounting points for a straightforward bolt-on install.
Enhance the sound and style of your 2018-2022 Harley Softail Fat Boy with Cobra 909-Twins 4" black slip-on mufflers. These mufflers deliver a classic Harley tone through a 2.25" perforated core, designed to give your bike a custom audio presence. The stealth-style downward-angle tip design ensures a clean and intentional look.
Why riders pick this
- Classic Harley V-twin sound from a 2.25" core
- Sleek black finish for a custom aesthetic
- Scalloped twin-tip design with hidden fasteners
- Downward-angle profile for a clean look
- 50-state street legal and EPA compliant
The Cobra 909-Twins 4" black slip-on mufflers are engineered for Softail Fat Boy riders seeking a significant exhaust upgrade. These slip-ons feature a durable black finish that complements your bike's aesthetic, while the scalloped twin tips hide external hardware for a smooth appearance. They bolt directly onto your stock header pipes, offering a straightforward installation and an immediate improvement in exhaust note.
Distinctive V-Twin Sound and Finish
- Classic Harley V-twin tone from a 2.25" perforated core
- Aggressive black finish for a custom look
- Scalloped twin tips with a clean, downward-angled profile
- 50-state street legal and EPA compliant
- Direct bolt-on installation for 2018-2022 Softail Fat Boy
Optimized Performance, Easy Install
These Cobra 909-Twins slip-ons are designed to provide a recognizable Harley sound while adhering to legal requirements. While slip-ons typically don't require an ECU reflash, a fuel tune can further optimize performance and throttle response, especially if you have other engine modifications. Confirm fitment for your specific Softail Fat Boy model year before ordering to ensure a perfect match.
Specifications
- Brand: Cobra
- Manufacturer Part #: 6520B
- Length: 33.5 in
- Width: 8 in
- Height: 5.25 in
- Weight: 11.68 lbs
Common questions
Do these slip-ons require a tuner or ECU flash?
Slip-on mufflers alone generally do not require remapping. However, if you combine them with other performance modifications, a fuel tune can optimize your bike's performance.
Are these slip-ons street legal?
Yes, these Cobra 909-Twins 4" slip-ons are 50-state street legal and comply with EPA noise and emissions standards.
What kind of sound can I expect from the 2.25" core?
The 2.25" perforated core delivers a traditional, recognizable Harley tone that is present without being overly aggressive, offering a significant upgrade from stock.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Cobra |
| TYPE | Exhaust |
| SKU | 82-96072 |
| WEIGHT | 11.68 lb |
