IRL F97/F98 X3M/X4M MaxFlow Resonated Downpipes
Refine the sound of your S58 without sacrificing performance with the IRL MaxFlow Resonated Downpipes for the BMW F97 X3M and F98 X4M. Designed for enthusiasts who want maximum exhaust flow with a deeper, smoother exhaust note, these downpipes reduce unwanted rasp while maintaining the aggressive character the S58 is known for.
Constructed from premium 304 stainless steel, each downpipe features precision TIG welding, smooth mandrel bends, CNC-machined flanges, and a fully integrated stainless steel heat shield to help reduce underhood temperatures and improve thermal management. The integrated resonators smooth out harsh exhaust frequencies, delivering a deeper, cleaner exhaust note without sacrificing the aggressive S58 sound.
By significantly reducing factory exhaust backpressure, the IRL MaxFlow Resonated Downpipes allow the turbochargers to spool faster, improve throttle response, and unlock additional horsepower and torque when paired with the proper ECU calibration. Integrated flex sections help absorb engine movement and reduce stress on the exhaust system, ensuring long-term durability under demanding conditions.
Whether paired with the factory exhaust or an aftermarket cat-back, the IRL MaxFlow Resonated Downpipes provide the perfect balance of performance, sound quality, and everyday drivability.
Features
- Designed specifically for BMW F97 X3M & F98 X4M (S58)
- Integrated resonators for a deeper, smoother exhaust tone
- Reduces unwanted rasp while maintaining an aggressive exhaust note
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Fully integrated stainless steel heat shields to reduce underhood temperatures
- Premium 304 stainless steel construction
- Precision TIG-welded with smooth mandrel-bent tubing
- CNC-machined flanges for precise OEM-style fitment
- Integrated flex sections to reduce vibration and exhaust stress
- Faster turbo spool and improved throttle response
- Increased horsepower and torque potential with proper tuning
- Direct bolt-on installation with no permanent modifications
Please Note: These downpipes are intended for off-road/racing use only and may trigger a Check Engine Light depending on your vehicle’s software calibration. Professional installation is strongly recommended.
Maximum Flow. Refined Sound. 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.
