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IRL MaxFlow Race 400 Cell Downpipes BMW G87 M2 / G80 M3 / G82 M4

Price
$1,199.00
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

Upgrade the restrictive factory downpipes on your S58-powered BMW with the IRL MaxFlow 400-Cell High-Flow Catted Downpipes. Featuring 3-inch tubing and premium 400-cell metallic catalytic converters, the MaxFlow design reduces exhaust backpressure to improve turbocharger efficiency, throttle response, and overall performance while retaining a more refined exhaust character than lower-cell-count or catless downpipes. Improved exhaust flow helps the S58's twin turbochargers spool more quickly and adds a deeper, more aggressive tone without introducing the harshness commonly associated with more extreme downpipe setups. Constructed from T304 stainless steel with precision TIG welds, these downpipes are designed for long-term durability and OEM-style fitment. They're also compatible with the factory exhaust and most aftermarket cat-back systems, making them an excellent first step for a street-oriented performance build or supporting modification for a tuned S58.

Fitment Notes

  • Fits BMW G87 M2 (S58)
  • Fits BMW G80 M3
  • Fits BMW G81 M3 Touring
  • Fits BMW G82 M4 Coupe
  • Fits BMW G83 M4 Convertible
  • Direct bolt-on installation using OEM mounting locations
  • Compatible with the factory exhaust system
  • Compatible with most aftermarket cat-back exhaust systems
  • ECU tuning is not listed as mandatory, but IRL recommends tuning to optimize performance and catalyst efficiency
  • The 400-cell design reduces the likelihood of a catalyst-efficiency CEL compared with lower-cell-count options, but IRL does not guarantee CEL-free operation
  • Not EPA certified; IRL specifies these downpipes for off-road and motorsport use only where permitted by law

Included

  • Driver-side IRL MaxFlow catted downpipe
  • Passenger-side IRL MaxFlow catted downpipe
  • Integrated 400-cell metallic catalytic converters

Product Specs

  • IRL Part Number: IRL-G8X-400C
  • Downpipe Diameter: 3 inches
  • Catalyst Type: 400-cell high-flow metallic
  • Material: T304 stainless steel
  • Construction: Precision TIG welded
  • Configuration: High-flow catted downpipes
  • Installation: Direct bolt-on
  • Designed for the BMW S58 twin-turbocharged engine
  • Compatible with OEM and most aftermarket exhaust systems

Product Features

  • 400-cell metallic catalysts provide a strong balance between increased exhaust flow, improved sound, and a more refined character than lower-cell-count alternatives
  • 3-inch MaxFlow design reduces backpressure and improves exhaust flow from the S58's twin turbochargers
  • Improved flow supports quicker turbo spool, sharper throttle response, and increased horsepower and torque
  • Produces a deeper performance exhaust note without the excessive harshness commonly associated with more aggressive downpipes
  • Premium T304 stainless steel construction and precision TIG welding provide excellent durability in high-temperature turbocharged applications
  • OEM-style mounting and compatibility with factory or aftermarket exhaust systems make installation straightforward and future exhaust upgrades easier