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S&S Mk45 4-1/2" Slip-On Exhaust

(1 review)

Item: 359334

$683.96 – $719.96

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Select Your Vehicle - Fitment Guaranteed

S&S Mk45 4-1/2" Slip-On Exhaust


4.5" slip-on mufflers from S&S are the result of decades of riding, racing and tuning. Combining both, a stainless steel perforated core baffle with RaceTEX cartridge packing, they create a deep rumble and improved horsepower and torque, all while adding a unique look with styled aluminum end caps.

  • Stainless steel baffle with RaceTEX cartridge packing
  • Show quality finish
  • Dual muffler design bolts up to stock diameter head pipes with ease
  • Removable J2825 compliant dB reducers included
  • Sold in pairs
  • Made in the USA
Specification Details
CARB Approved Varies (make selection above)
Configuration Dual Muffler
Country of Origin USA
Engine Type Varies (make selection above)
Exhaust Diameter 4-1/2 in.
Muffler End Cap Varies (make selection above)
Muffler Sleeve Varies (make selection above)
Warranty Varies (make selection above)

Vehicle Fitment


Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

Harley Davidson
  • FLHR Road King 1995-2022
  • FLHRC Road King Classic 2007-2013
  • FLHRCI Road King Classic 1998-2006
  • FLHRI Road King 1996-2006
  • FLHRS Road King Custom 2004-2007
  • FLHRSI Road King Custom 2004-2006
  • FLHRXS Road King Special 2017-2023
  • FLHT Electra Glide Standard 1995-2009, 2019-2022
  • FLHTC Electra Glide Classic 1995-2005, 2007-2013
  • FLHTCI Electra Glide Classic 1996-2006
  • FLHTCU Electra Glide Ultra Classic 2017-2019
  • FLHTCU Ultra Classic Electra Glide 1995-2016
  • FLHTCUI Ultra Classic Electra Glide 1995-2006
  • FLHTCUL Electra Glide Ultra Classic Low 2015-2016
  • FLHTCUTG Tri Glide Ultra Classic 2018-2024
  • FLHTI Electra Glide Standard 2003-2006
  • FLHTK Electra Glide Ultra Limited 2010-2023
  • FLHTKL Electra Glide Ultra Limited Low 2015-2019
  • FLHX Street Glide 2006-2009, 2011-2023
  • FLHXI Street Glide 2006
  • FLHXS Street Glide Special 2014-2023
  • FLHXST Street Glide ST 2022-2023
  • FLRT Freewheeler 2017-2022
  • FLTCU Ultra Classic Tour Glide 1995
  • FLTCUI Ultra Classic Tour Glide 1996
  • FLTR Road Glide 1998-2004, 2007-2009
  • FLTRI Road Glide 1998-2006
  • FLTRK Road Glide Limited 2020-2023
  • FLTRU Road Glide Ultra 2011-2013, 2016-2019
  • FLTRX Road Glide 2015-2016
  • FLTRX Road Glide Custom 2011-2013
  • FLTRXS Road Glide Special 2015-2023
  • FLTRXST Road Glide ST 2022-2023

Customer Reviews

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S&S Mk45

By   on  Verified Purchaser

Great looking and sound awesome.


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Questions & Answers

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Will I need to have my 2020 FLHXS remapped after installing the S&S Mk45 4.5" Slip-On Mufflers?

Will I need to have my 2020 FLHXS remapped after installing the S&S Mk45 4.5" Slip-On Mufflers?

If you do not have any other performance modifications done to your bike, you should not need to have the bike tuned/mapped differently for the installation of these mufflers.

By Andy
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