Unlock the full potential of your S58-powered BMW with the IRL 3.5” MaxFlow Race Downpipes. Designed and engineered for enthusiasts demanding maximum performance, these downpipes eliminate the restrictive factory catalytic converters and feature a true 3.5-inch mandrel-bent design for exceptional exhaust flow, faster turbo spool, and increased horsepower and torque.
Unlike smaller diameter alternatives, the IRL MaxFlow design minimizes backpressure while maintaining smooth exhaust velocity, allowing your turbos to operate more efficiently. The result is improved throttle response, reduced turbo effort, and an aggressive motorsport-inspired exhaust note that perfectly complements the S58 engine.
Each set is precision TIG welded from premium T304 stainless steel and engineered for a direct bolt-on installation using factory mounting locations. Designed to pair seamlessly with both the OEM exhaust and aftermarket cat-back systems, these race downpipes deliver uncompromising performance for street and track applications where emissions compliance is not required.
Features
- True 3.5” MaxFlow mandrel-bent design
- Premium T304 stainless steel construction
- Precision TIG welded for maximum durability
- Increased horsepower and torque potential
- Faster turbo spool and improved throttle response
- More aggressive exhaust tone with enhanced turbo sound
- Direct bolt-on installation with OEM-style fitment
- Compatible with factory and most aftermarket exhaust systems
Vehicle Fitment
- BMW G80 M3
- BMW G81 M3 Touring
- BMW G82 M4 Coupe
- BMW G83 M4 Convertible
- All S58-powered models (2021+)
For Off-Road/Racing Use Only: These race downpipes remove the factory catalytic converters and are intended for closed-course competition vehicles only. A check engine light (CEL) is expected on factory engine calibrations. ECU tuning is recommended to maximize performance and optimize operation.
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.
