S&S Cycle 4-1/2" MK45 Performance Mufflers — Chrome Thruster

In warehouse stock

S&S Cycle 4-1/2" MK45 Performance Mufflers — Chrome Thruster

S&S Cycle · #1801-1074 · SS_Cycle_Drag_General / Slip-Ons

Mk45 4-1/2" Touring Mufflers are the result of decades of riding, racing and tuning
Combines both a stainless steel baffle and RaceTEX cartridge packing
Create a deep rumble and improved horsepower and torque, all while adding a unique look with styled aluminum endcaps
Removable dB reducer
Made in U.S.A.

$819.95

In stock. Ships in 2–4 business days · free shipping over $150.

Questions? Call the shop: 801-361-3010

Real shop · real humans · 1231 N 1300 W Ste A, Centerville, UT 84014

Description & features6 features

Mk45 4-1/2" Touring Mufflers are the result of decades of riding, racing and tuning
Combines both a stainless steel baffle and RaceTEX cartridge packing
Create a deep rumble and improved horsepower and torque, all while adding a unique look with styled aluminum endcaps
Removable dB reducer
Made in U.S.A.
Not for Trike applications

Specifications12 specs

Riding Style: Street
Type: Slip-On
Units: Pair
End Cap Color/Finish: Chrome, Polished
End Cap Material: Aluminum
End Cap Style: Thruster
Muffler Color/Finish: Chrome
Model: MK45
Outer Diameter: 4-1/2"
Shipping weight: 29.1 lb
Package size: 36.6 × 16.9 × 11.2 in
Country of origin: USA

Fitment21 models · Harley-Davidson

Harley-Davidson21 models

Electra Glide Police FLHTPI2017–2025
Electra Glide Police FLHTP2025
FLHR Road King2017–2022
FLHRXS Road King Special2017–2025
FLHT Electra Glide Standard2019–2022
FLHTCU Electra Glide Ultra Classic2017–2019
FLHTK Ultra Limited2017–2024
FLHTKL Ultra Limited Low2017–2019
FLHTKSE CVO Limited2017–2021
FLHX Street Glide2017–2025
FLHXS Street Glide Special2017–2023
FLHXSE CVO Street Glide2017–2025
FLHXST Street Glide ST2022–2023
FLHXU Street Glide Ultra2025
FLTRK Road Glide Limited2020–2024
FLTRKSE CVO Road Glide Limited2022–2023
FLTRU Road Glide Ultra2017–2019
FLTRX Road Glide2017–2022
FLTRXSE CVO Road Glide2018–2022
FLTRXST Road Glide ST2022
Street Glide EFI FLHX2025

Fitment comes from the distributor’s catalog. Double-check your year, model and trim before you order — or call the counter at 801-361-3010 and we’ll check it with you.

Part numbers

Salto part #: 1801-1074
S&S Cycle part #: 550-0665

Shipping

In stock at a distributor warehouse. Ships in 2–4 business days by ground.

Ground shipping is $14.95, free on orders over $150. Stock is re-checked with the warehouse before your card is charged.

Questions4 answers

Is it in stock?: Yes — the distributor shows it on a shelf at a regional warehouse right now. We check again the moment you order, before anything is charged.
How fast will it get to me?: Usually 2–4 business days by ground.
Will it fit my machine?: The distributor lists it for the models in the Fitment section above. Not sure about your trim or year? Call the counter at 801-361-3010 and we’ll check it with you.
Is this genuine S&S Cycle?: Yes. It ships new from the same distributors the big online stores buy from — S&S Cycle part #550-0665.