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Milltek Secondary Catalyst Bypass BMW G80 M3 / G82 M4

SKU: SSXBM1342
Price
$1,228.36
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

Enhance the sound and performance of your BMW G8X with the Milltek Secondary Catalyst Bypass. Designed to replace the restrictive factory secondary catalytic converters, this non-resonated mid-pipe improves exhaust flow while unlocking a deeper, more aggressive exhaust note from the twin-turbo S58 engine. The integrated X-pipe helps balance exhaust pulses between both cylinder banks, improving exhaust scavenging, turbo efficiency, and throttle response throughout the rev range. Manufactured from premium T304L stainless steel, this direct-fit system is engineered to work seamlessly with either the factory axle-back exhaust or a compatible Milltek axle-back system. Whether you're looking for a more exciting driving experience or preparing your M3 or M4 for track use, the Milltek Secondary Catalyst Bypass delivers the sound and performance enthusiasts expect.

Fitment Notes

  • Fits 2021+ BMW G80 M3 & M3 Competition (S58)
  • Fits 2021+ BMW G82 M4 & M4 Competition (S58)
  • Compatible with the factory axle-back exhaust or Milltek axle-back exhaust (configuration dependent)
  • Designed for vehicles with OEM downpipes
  • Direct bolt-on installation using factory mounting points
  • Intended for off-road and closed-course competition use only due to the removal of the factory secondary catalytic converters

Included

  • Milltek Secondary Catalyst Bypass mid-pipe
  • Integrated X-pipe assembly
  • Required clamps and mounting hardware
  • Installation instructions (when supplied by Milltek)

Product Specs

  • 304L aircraft-grade stainless steel construction
  • Mandrel-bent tubing
  • 102mm (4.0-inch) single mid-pipe with integrated X-pipe
  • Non-resonated design
  • Direct bolt-on installation
  • Utilizes OEM mounting points and exhaust hangers
  • Typical installation time: 1.5-2.0 hours

Product Features

  • Removes the restrictive factory secondary catalytic converters for improved exhaust flow
  • Integrated X-pipe enhances exhaust scavenging and turbocharger efficiency
  • Produces a deeper, more aggressive exhaust note with increased volume
  • Premium 304L stainless steel construction offers exceptional corrosion resistance and durability
  • Direct-fit design requires no cutting or welding
  • Compatible with both OEM and select Milltek axle-back exhaust systems