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Product Information

The Borla S-Type Axle-Back is a rear-section-only exhaust for a 2018-2023 Ford Mustang: GT, Bullitt (2019-2020), Mach 1 (2021-2023), replacing everything from the axle back only, the rear-most section.

Why Upgrade

Per Borla, this system offers:

  • Borla's patented straight-through, multi-core technology, which Borla says unlocks hidden horsepower and increases exhaust velocity
  • T-304 stainless steel construction throughout
  • steel Borla says outlasts the cheaper T-400-series (like 409) steel some competitors use
  • polished stainless tips, per Borla's listing
  • mandrel-bent tubing and CNC-controlled manufacturing for consistent flow and a precise fit
  • a Borla Million-Mile warranty on the system

Fitment Notes

Fits 2018-2023 Ford Mustang: GT, Bullitt (2019-2020), Mach 1 (2021-2023). Does not fit Mustang: EcoBoost, GT500, GT350. Per Borla's own listing: "It fits both the coupe and convertible models." This specific system is built for Mustangs WITHOUT Ford’s factory Active Valve Performance option; check your car’s build sheet before ordering, since Borla makes separate systems for cars with and without it.

More Axle-Back parts that fit your Mustang

Install and Honest Talk

This is the rear section only, bolting on behind your factory or existing mid-pipe; it does not touch the catalytic converters either way, so it changes sound and, per Borla, exhaust flow, not emissions equipment. Expect a louder exhaust note than stock, with some drone at certain highway RPMs possible, which is common for aftermarket exhausts. Borla does not list a dyno figure for this specific system. What else you need: [VERIFY: whether new gaskets, clamps, or hangers are included, and whether it bolts directly to your specific mid-pipe or needs trimming].

Specs

  • Brand: Borla
  • Type: S-Type Axle-Back
  • Material: T-304 stainless steel
  • Valves: No valves (fixed exhaust note)
  • Fits: 2018-2023 Ford Mustang: GT, Bullitt (2019-2020), Mach 1 (2021-2023)
  • Excludes: Mustang: EcoBoost, GT500, GT350
  • Part number: 11953
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