The leading E46 subframe reinforcements available!

Our E46 Subframe/RACP solutions

All our reinforcement kits come with a comprehensive, spiral bound installation manual detailing not just to how perform the install but, how to inspect, repair and address all problem areas of the Rear Axle Carrier Panel (RACP). We want to ensure every reinforcement, whether DIY or professional is reliable and permanent.

Stage 1

Underside Reinforcement Plates


  • The Most Rigid Subframe Reinforcement Kit on the Market
  • The Greatest Coverage Available
  • Superior Fitment From CNC Brake Press Folding
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Stage 2

Topside Beam Kit


  • Perfect Fitment for All E46's
  • Corrects Stress Transfer for Permanent Peace of Mind
  • Increases Chassis Rigidity for a More Stable, Better Handling Car
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Stage 2.5

Front Mount Extension Kit


  • For E46 Coupe's & Sedans with Split Folding Rear Seats Only
  • Increases Rigidity & Reinforces Front 2, Rear Subframe Mounts
  • Prevents Cracking & Spot Weld Failure Beneath Rear Seats
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Stage 3

6-Point Race Brace


  • The Ultimate Bolt In Brace with Original Cabin Interior
  • Triangulates All Four Subframe Mounts with Rear Shock Towers
  • Race Car Chassis Rigidity with Street Car Practicality

Take advantage of the added structural integrity and check out our range of performance suspension upgrades to make your E46 handle like a weapon!

About US

The Story of CMP Auto Engineering.
BMW E46 Subframe Repair Specialist

CMP Auto Engineering was created out of necessity to provide E46 3-series owners with reliable and high quality solutions to address the notorious subframe failures once and for all. CMP AE has since developed a complete range of comprehensive reinforcement kits and aftermarket suspension upgrades to perfect the chassis and handling characteristics of one of the most iconic BMW's ever made.

  • Designed by Mechanical Engineers

    All of our products and systems are designed and developed by Australian Mechanical Engineers.

  • Australian Made

    Our products are manufactured in Australia using local suppliers and made available to customers anywhere in the world.

  • Direct Customer Support

    Need help? Our team is available anytime to provide direct customer support during any aspect of the process from enquiries to installation.

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