Unlock the full potential of your BMW with the IRL MaxFlow Downpipes, engineered for enthusiasts seeking maximum performance, faster turbo response, and an aggressive exhaust note. Available in both 200 Cell Race and 400 Cell High Flow configurations, these downpipes are manufactured from premium 304 stainless steel and feature precision TIG welding, smooth mandrel bends, CNC-machined flanges, and fully integrated stainless steel heat shields for superior durability and thermal management.
Designed to reduce exhaust backpressure and improve overall exhaust flow, the IRL MaxFlow Downpipes allow the turbochargers to spool faster while increasing horsepower, torque, and throttle response. The integrated heat shields help reduce underhood temperatures, protecting surrounding engine components while maintaining OEM-style fitment and appearance.
Available Options
200 Cell Race Downpipes
Designed for maximum exhaust flow and the most aggressive exhaust note. Ideal for customers looking to maximize power and turbo performance while producing a louder, more exotic sound.
400 Cell High Flow Downpipes
Engineered to deliver an excellent balance of performance, sound quality, and emissions control. The 400 Cell catalyst offers a cleaner exhaust note and improved emissions performance compared to the 200 Cell version while still supporting substantial horsepower gains.
Features
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Available in 200 Cell Race or 400 Cell High Flow configurations
- Premium 304 stainless steel construction
- Fully integrated stainless steel heat shields
- Precision TIG-welded construction
- Smooth mandrel-bent tubing for maximum flow
- CNC-machined flanges for OEM-quality fitment
- Faster turbo spool and improved throttle response
- Increased horsepower and torque potential with proper tuning
- Direct bolt-on installation
Important Note: While the 400 Cell High Flow downpipes significantly reduce the likelihood of a Check Engine Light, IRL does not offer a No Check Engine Light Guarantee on these units. A CEL may still occur depending on your vehicle’s software calibration and operating conditions.
These products are intended for off-road and closed-course racing use only. They are not legal for use on public roads or highways where emissions regulations apply.
Built for Maximum Flow. Engineered for Performance.
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.
