S&S Cycle
- Free NZ shipping over $149 (excl. rural & bulky items)
- Ships in 1–2 business days from our NZ warehouse
- 90-day returns
- NZ price match
Shipping details · Returns policy
Product Description
Mk45 Slip-On Mufflers are the result of decades of riding, racing and tuning. Combining both a stainless steel perforated core baffle with Race-TEX cartridge packing, they create a deep rumble and improved horsepower and torque, all while adding a unique look with styled aluminum end caps.
Fitment
•2017–Up M8 touring models
Features and Benefits
•4.5" design — with stainless steel perforated baffle and Race-TEX cartridge packing
•Guardian Black muffler body finish
•Tuxedo Black Thruster end cap
•Produces a deep bass rumble throughout the RPM range
•Removable dB reducer
•Made in USA!
NOTE: Not recommended for Tri Glide® or other three wheel models including conversions due to ground clearance..
- Brand: S&S Cycle
- Part number: 550-0666
These are performance and custom aftermarket products sourced to match or exceed original specifications as an alternative to the OEM part. Any Harley-Davidson part numbers referenced are for identification purposes only.

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