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4" HP40 slip-on muffler for select 2025 HD Softails; free-flowing 4" design improves performance and produces a deep, throaty rumble.
3.5 in HP35 Slip-On for HD: DBX-style catalyst baffle for increased horsepower and torque. Easy install, tuning recommended. OEM gaskets required (not included). No O2 sensor holes.
High-performance synthetic motorcycle oil that resists oxidation, controls deposits, improves shift comfort, reduces noise and protects the clutch.
High-density friction plates increase surface area by 11% for longer clutch life; precision-manufactured drive plates; made in the U.S.A.
4.5" slip-on mufflers tuned for HD touring bikes. Works with stock head pipes; DBX Performance baffle for improved sound and power. Made in USA with a Forever Warranty.
- High-performance radial piston design with straight flow for fast response
- Anti-block and anti-fading systems for reliable damping
- 50/30-click rebound and compression adjusters
- Progressive spring with threaded preload; adjustable for solo or two-up riding
- Reduces oil from head breathers on M8 engines
- Boyesen one-way reed valve vents crankcase pressure
- No dipstick hose required
- Includes hose and breather filter