Cobra 909-TWINS 4" SLIP-ONS CHROME FLSB 18-22 - 2018-2025 — Harley-Davidson Softail Fat Boy 114, Softail Fat Boy (2018-2025)

Cobra 909-Twins 4" slip-on mufflers in chrome for 2018-2025 Harley-Davidson FLSB (Fat Boy). Twin-tip design with a 2.25" perforated core delivers traditional Harley sound while the downward-angle profile keeps a clean, stealth look on the bike.

Features

• 4" twin muffler ends angled downward for clean profile
• Scalloped twin-tip design with no visible external screws
• 2.25" perforated core for traditional Harley tone
• 50 State legal
• Made in the USA
• Limited Lifetime Warranty

Specifications

• Brand: Cobra
• Manufacturer Part #: 6520
• Length: 33.5 in
• Width: 8 in
• Height: 5.25 in
• Weight: 12.03 lbs
• Country of Origin: USA

Fitment

Fits 2018-2025 Harley-Davidson FLSB (Fat Boy) models.

Frequently Asked Questions

Will these fit my 2017 or earlier Fat Boy?

No — these slip-ons are engineered for 2018-2025 FLSB models only. Older Fat Boys require a different part number.

Are these 50 State legal?

Yes. This configuration meets EPA emissions and noise standards for all 50 states.

What sound do I get with the 2.25" core?

A traditional, recognizable Harley tone — not overly aggressive, but with good presence when you roll on the throttle.

Will I need to tune my bike after installing these?

Slip-ons typically do not require a fuel map change, but a tune can optimize performance if you have other modifications. Check with your dealer.

What's included in the box?

The pair of chrome slip-on mufflers and all mounting hardware needed for installation onto stock head pipes.