Millway Motorsport BMW E46 M3 Rear Brake Caliper Adapter Brackets Kit - Porsche Boxster S/Porsche Rear Caliper Conversion, Retains OEM Rear Discs

Millway Motorsport BMW E46 M3 Rear Brake Caliper Adapter Brackets Kit - Porsche Boxster S/Porsche Rear Caliper Conversion, Retains OEM Rear Discs

£225.00
£225.00
Sold out
Tax included. Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Unlock a proven rear brake upgrade for your BMW E46 M3 with the Millway Motorsport brake caliper adapters. Designed to fit Porsche Boxster S rear calipers and similar Porsche rear calipers to the E46 M3 while retaining your original rear discs, this caliper adapter kit is the ideal solution for a clean, reliable Porsche caliper conversion on the E46 platform.

If you are searching for E46 M3 rear brake upgrade, E46 M3 Porsche caliper conversion, Porsche Boxster S caliper brackets, E46 M3 caliper adapters, or BMW E46 rear big brake kit, this Millway adapter set delivers the fit, strength and simplicity you need for fast road and track day use.

  • Direct-fit adapter brackets to mount Porsche Boxster S rear calipers and similar Porsche rear calipers to the E46 M3
  • Uses the original BMW E46 M3 rear discs for a cost-effective and OEM-style solution
  • Made from steel and precision milled to be as lightweight as possible without compromising strength
  • Includes 12.9 grade high-tensile hardware for secure, confident installation
  • Priced per axle set

We use and recommend these Millway Motorsport brake caliper adapters, and our customers consistently praise the fitment and braking consistency after converting their E46 M3 to Porsche rear calipers. The result is a tidy, dependable rear brake conversion that integrates perfectly with your E46 M3 setup.

Ideal for

  • E46 M3 rear brake upgrade
  • Porsche Boxster S caliper swap on E46 M3
  • Track day and fast road builds seeking improved pad options and caliper stability
  • Clean, bolt-on rear brake conversion using OEM discs

Compatibility

BMW E46 M3 rear axle using Porsche Boxster S rear calipers and similar Porsche rear calipers. Retains original E46 M3 rear discs.

What is included

  • Millway Motorsport rear brake caliper adapters for E46 M3
  • 12.9 grade mounting hardware
  • Sold per axle set

Installation and fitting

Professional installation is recommended. For expert fitting, Nforcd in Warwickshire can help. Request a quote at Sales@nforcd.com.

Notes

  • Calipers, discs and pads are not included
  • Torque all fasteners to the manufacturer’s specification and use appropriate thread locking where required

Keywords to help you find the right kit: Millway Motorsport brake caliper adapters, Porsche rear caliper adapter E46 M3, BMW E46 M3 rear brake conversion, Boxster S caliper brackets, E46 M3 rear big brake kit, rear caliper brackets, Porsche caliper swap E46, high tensile 12.9 hardware, steel milled lightweight adapters, bolt-on rear brake upgrade.