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Unleash the full fury of your BMW M5 G90, G99, or other G9X-series with the S68 twin-turbo V8 by upgrading to a Catless Exhaust Downpipe. Designed for maximum performance, sound, and turbo efficiency, this is the go-to mod for enthusiasts who want their M car to breathe and scream like it should.
Fitment:
BMW M5 G90 / G99 Touring / G9X-Series
Engine: S68 4.4L Twin-Turbo V8 (2024+)
Type:
Catless Downpipe – no catalytic converter
Designed for track/off-road use only (not street-legal in many regions)
Material:
T304 Stainless Steel or Titanium (optional upgrade)
TIG welded with precision CNC flanges
Heat-resistant and corrosion-proof finish
Key Benefits:
Massive power gains – Up to 30-50hp and 60-80Nm with tune
Quicker turbo spool and reduced backpressure
Raw, aggressive exhaust note – burbles, pops, and full turbo sound
Weight reduction compared to OEM downpipes with cats
Improved thermal efficiency and durability under high load
Installation:
Bolt-on fitment with OEM-style flanges
Compatible with factory or aftermarket cat-back systems
Requires ECU tune to avoid CEL (Check Engine Light)
O2 Sensor Spacers / CEL Deletes
Heat wrap / ceramic coating for thermal management
ECU tuning for optimal power and CEL delete
Valved exhaust system pairing for full performance control
1x Set of Catless Downpipes (left + right)
Mounting hardware & gaskets
Optional: O2 sensor extensions or defoulers
High-flow intake system
Valved rear muffler system
ECU Stage 1/2 tune (BM3, MHD, etc.)
Charge pipes / Intercooler upgrades
Note:
video is paired with original exhaust
All items are subject to a handling period before they are dispatched. 99% of orders leave the warehouse within 1-3 days of payment. We will notify you by email when your items have been shipped. Most items should be received within 3-7 business days of your order date. This may be longer for international delivery.
* DELIVERY TIME= Processing Time + Shipping Time
* These shipping times are estimates, not guarantees but we always strive to get your order to you as soon as possible.
Shipping Costs:
● Shipping fees are calculated at checkout based on your location and the chosen shipping method.
Order Tracking:
● Once your order ships, you will receive a confirmation email with a tracking number and a link to monitor your shipment's status.
International Shipping:
● We ship internationally to selected countries. Rates and delivery times vary by destination.
Customs Fees and Import Duties:
● International orders may incur customs duties and taxes, which are the customer's responsibility. Please check with your local customs office for details.
Lost or Damaged Shipments:
● We are not liable for packages that are lost or damaged during shipping. For damaged items, please contact the shipping carrier to file a claim.
Customer Service Contact:
● For any questions regarding shipping, reach out to our customer service team at sales@sbxperformance.com
We have a 30-day return policy, which means you have 30 days of purchase your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
-Returns accepted within 30 days of purchase if the item is unused and in original packaging.
-Customer is responsible for return shipping unless the product is defective.
-Refunds processed within 5-7 business days after receiving the returned item.
To start a return, you can contact us at sales@sbxperformance.com.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at sales@sbxperformance.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
We do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at sales@sbxperformance.com.