ARM Motorsports S55 3.5" Resonated Midpipe Upgrade - F80/F82/F83 M3/M4

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ARM MotorsportsSKU: S55MID DIY Difficulty: INTERMEDIATE


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Introducing the ARM Motorsports S55 Single Midpipe Upgrade for the F8X platform, the ultimate solution for S55 enthusiasts seeking to enhance the power and sound from their S55-powered BMW. This S55 Midpipe upgrade delivers improved exhaust flow and an incredible exhaust note due to the resonated 3.5" design.  Check out the clips below to hear the ARM S55 Midpipe paired with the ARM S55 Resonated Downpipes.

Crafted from 304 stainless steel, the ARM S55 Midpipe Upgrade is built to last. Its mandrel-bent tubing ensures smooth, unrestricted flow, while the lightweight design of only 17lbs reduces overall weight of the exhaust system by 15lbs. When paired with the ARM S55 Track Exhaust, you shave an incredible 40lbs off compared to the OEM exhaust system.

Due to the larger size of the ARM S55 Midpipe, the OEM under-brace cannot be utilized. To address this, the ARM S55 Midpipe includes a specially designed under-brace that is specifically engineered to fit with the larger midpipe.  The under brace included in the ARM S55 Midpipe Kit is designed with  precision and manufactured from 6061 aluminum to ensure strength, durability, and a perfect fit, while keeping the weight to a minimum.  Installation of the under brace is a simple bolt-on process and mounts directly to the factory mounting points, ensuring a secure and stable fit.


  • Up to +20whp / 30wtq
  • Improved Exhaust Note
  • 304 Stainless Steel
  • Faster Turbo Spool
  • Fits OEM and Aftermarket Mufflers

What's Included:

  • ARM S55 Midpipe
  • CNC Machined Brace
  • 5x Exhaust Clamps

Vehicle Fitment

Model   + Drivetrain  
F30 - F80 M3 3.0T I6 [S55] +
F32 - F33 - F36 - F82 - F83 M4 3.0T I6 [S55] +

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