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S&S GNX Slip-On Mufflers

(3 reviews)

Item: 395058

$512.96 – $575.96

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S&S GNX Slip-On Mufflers


The M8 engine is a powerhouse, but a low idle combined with a plugged up exhaust conspire to mute the true sounds of freedom that this machine was designed to emit. Not to worry, S&S have created the GNX slip-ons with one thing in mind; belting out the flag waving, eagle flying song of the American V-twin.

Combining a 4.5" shell with a tuned baffle and race inspired tip, the GNX lets the sound and power flow out of the M8. Each muffler includes a removable dB reducer that lets you tune the sound to suit your version of the American dream. Made in America, the GNX features their new durable Guardian Black finish and is relieved for shocks up to 13.5".

  • Give your M8 a true V-Twin rumble without a full system
  • 4.5" slip-on with premium fit, finish, sound and power
  • Unique louvered baffle delivers a rowdier tone, even with stock headpipes
  • S&S Racing heritage styled endcap in Tuxedo Black finish
  • SAE J2825 Sound Level Compliant (with included dB reducer installed)
  • CARB approved
  • Made in USA
Specification Details
Baffles Included Yes, Non-Removable
CARB Approved Yes
Configuration Dual Muffler
Country of Origin USA
Exhaust Diameter 4-1/2 in.
Finish Varies (make selection above)
Muffler End Cap Black
Muffler Sleeve 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 2017-2021
  • FLHRXS Road King Special 2017-2023
  • FLHT Electra Glide Standard 2019-2022
  • FLHTCU Electra Glide Ultra Classic 2017-2019
  • FLHTK Electra Glide Ultra Limited 2017-2023
  • FLHTKL Electra Glide Ultra Limited Low 2017-2019
  • FLHX Street Glide 2017-2023
  • FLHXS Street Glide Special 2017-2023
  • FLTRK Road Glide Limited 2020-2023
  • FLTRU Road Glide Ultra 2017-2019
  • FLTRXS Road Glide Special 2017-2023

Customer Reviews

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S&S GNX Mufflers

By   on  Verified Purchaser

These would be great without the cat delete headers. At a steady cruising throttle they're tolerable.


Very quality product

By   on  Verified Purchaser

These slip-ons are great! They make my Street Glide Special sound so much better. When you crank the throttle, they sound incredible. Thank you.


2021 FLTRXS

By   on 

The mufflers look and sound as advertised. The muffler clamps have an Allen head bolt. The directions say nothing about needing a 6 mm Allen head socket. Should have not followed the directions and use the original Harley muffler clamps. As one of the Allen head bolts stripped out while trying to torque down to spec.


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