IRL MaxFlow Race Downpipes for BMW G90 & G99 M5
Unleash the full performance of your BMW G90/G99 M5 with the IRL MaxFlow Race Downpipes, engineered to maximize exhaust flow, improve turbocharger efficiency, and deliver the aggressive sound the S68 twin-turbo V8 deserves. By significantly reducing exhaust backpressure, the IRL MaxFlow Race Downpipes provide faster turbo spool, sharper throttle response, and increased horsepower and torque throughout the powerband.
Manufactured from premium 304 stainless steel, each downpipe features precision TIG welds, smooth mandrel bends, and CNC-machined flanges to ensure exceptional durability, leak-free performance, and OEM-quality fitment. Designed as a direct bolt-on replacement for the factory downpipes, installation requires no permanent modifications.
The IRL MaxFlow Race Downpipes transform both the performance and character of the G90/G99 M5, producing a deeper, more aggressive exhaust note while allowing the S68 engine to breathe as intended. Whether you’re running a factory tune or a high-performance calibration, these downpipes provide the airflow needed to support substantially higher power levels.
Features:
- Designed specifically for the BMW G90 & G99 M5 (S68 Twin-Turbo V8)
- High-flow race design for maximum exhaust performance
- Premium 304 stainless steel construction
- Precision TIG-welded with mandrel-bent tubing
- CNC-machined flanges for an OEM-quality seal
- Reduced exhaust backpressure for improved turbo efficiency
- Faster turbo spool and enhanced throttle response
- Increased horsepower and torque potential
- Aggressive, refined exhaust tone
- Direct bolt-on installation with OEM-style fitment
- Built for high-performance street and off-road competition applications
Maximum Flow. Maximum Performance. No Compromises. The IRL MaxFlow Race Downpipes are engineered for enthusiasts looking to unlock every bit of performance from the BMW G90/G99 M5.
It is a violation of Federal and Illinois State laws to use this product in a manner inconsistent with it’s labeling. Our products are "Legal Only For Racing Vehicles Which May Never Be Used, Or Registered or Licensed For Use, Upon A Highway."
These products are designed for off road purposes only It is NOT designed or intended to be used in any way that may violate any laws. IRL LLC will not be responsible for the use of Merchandise.
All products are shipped out from one of the Signature Autohaus shipping locations. Signature Autohaus drop ships some products and ships direct others. All products are shipped via FedEx, UPS, DHL or another qualified shipping carrier.
Special arrangements may need to be made for international orders and oversize packages.
In the event a product arrives damaged to your location, please follow the steps listed below. All damaged items must be reported to the shipping carrier immediately and you must notify Signature Autohaus within 5 days of receiving your order. If these steps are not followed, your shipment may not be able to be a candidate for a claim.
Complete the Shipping DAMAGE Claim Form by contacting the carrier that delivered your package.
1) Keep the product and its original packaging and box
Make a list of the damaged or lost item(s)
2) Signature Autohaus will contact the shipper once we receive the email info above to schedule a pickup, DO NOT send it back to us
3) Once the product is picked up and inspected by Signature Autohaus and or Supplier, a replacement or credit will be issued.
4) The Shipping Rates shown at time of checkout our dimensional rate only. If your shipment weight is to much then contact us for a shipping quote. If there is an error in the shipping rate quoted we will contact you and let you know of the changes. International orders(Outside the USA) are not automatically processed as we may require additional information from you.
If a product is ordered and not wanted, the UNUSED item can be returned for a 35% restocking fee. Shipping is not refundable in either direction. All items wanting to be return MUST be reported within 30 days of the original invoice date. No items will be returnable after 30 days. All products shipped from the Signature Autohaus warehouse are shipped via FedEx or Freight and require a signature when delivered. Some packages shipped from the manufacturer may or may not require signatures for package release. Fedex, UPS, and DHL have package pick up locations if you are unable to sign for the package. If the package is returned to Signature Autohaus or manufacturer, you will be responsible for the return shipping costs and pay a 35% restocking fee. These fees will be charged to your account on file.
SIGNATURE AUTOHAUS DOES NOT REFUND SHIPPING CHARGES. If you modify, install, or alter the item in any form, we cannot accept it as a return, will not cover any expenses related to the product or installation, and you maybe be required to purchase a replacement.
In the event that the product you ordered is sent either incorrectly or processed wrong by Signature Autohaus, we will arrange for the package to come back to us and ship out a replacement. We will evaluate the situation before we determine the shipment was incorrect.
To return a item back to us, please do the following:
1. Contact our Customer Service Department to receive a RMA number. All packages returned without a Returned Merchandise Authorization number will be refused.
2. Package the item up in original packaging unless deemed unuseable
3. Include the UNUSED parts and any additional information that was included
4. Include a copy of your receipt
5. Write a brief description of the problem with the product
6. If you have a receipt for the return shipping include as well
7. We DO NOT accept any freight collect packages
8. Once we have received the above information we will notify you via email or phone and let you know the status.
