Mastermind Racing
Mastermind Racing B58 Downpipe Upgrade 2017 – 2022 BMW X3 M40iX G01 & X4 M40iX G02
Mastermind Racing B58 Downpipe Upgrade 2017 – 2022 BMW X3 M40iX G01 & X4 M40iX G02
MMR-CLDP-B58
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Authorized Distributor
Authorized Distributor
PINNACLE GARAGE USA is an authorized distributor for top automotive brands, ensuring you receive genuine, high-quality products directly from the manufacturer. Shop with confidence knowing you're getting authentic, warrantied parts at the best prices
Price Match Guarantee
Price Match Guarantee
We are committed to offering you the best prices on the market. If you find the same product at a lower price from an authorized distributor, we’ll match it! The competitor’s price must be current, publicly advertised, and the product must be in stock. Please note that we do not price match listings from third-party marketplaces such as eBay, Amazon, or unauthorized resellers. To request a price match, simply click "Make an Offer" under the Add to Cart button and submit your request.
Shipping & Handling
Shipping & Handling
Our handling time is 1-3 business days unless stated otherwise. If an item is on backorder, you will receive an email notification within 24 hours. Shipping times vary based on location and carrier.
Returns & Refunds
Returns & Refunds
To be eligible for a return, the item must be in its original packaging, unused, unmodified, unpainted, the return item should be in the same condition as it was received.
It is our goal to provide 100% satisfaction and peace of mind to our customers. There is a 30-day return period from the date the item is received. Return shipping will not be provided, unless otherwise noted. We will offer refund of the item price only. This means the shipping cost of the item will not be refunded back to you and an invoice of the cost of shipping will be provided to you. Modified/Used returns, or Returns outside of the 30-day policy will not be refunded or returned to the customer unless otherwise noted.
Return packaging will NOT be provided. Please contact our support team prior to returning an item.
If you received a damaged or broken item, please contact us immediately with photos of the package and item.

Mastermind Racing 4.5″ Race Downpipe – BMW G01 X3 M40iX & G02 X4 M40iX
Introducing the Mastermind Racing Race Downpipe for your B58-powered BMW X3 M40iX and X4 M40iX. This is the best bang-for-the-buck performance mod available for your B58, designed to unlock power, improve turbo response, and enhance exhaust tone.
By replacing the restrictive factory catalytic converter with Mastermind's free-flowing race downpipe, back pressure is drastically reduced, resulting in faster turbo spool, increased horsepower, and a more aggressive exhaust note.
Mastermind Racing's downpipe features a full 4.5″ TIG-welded 304-grade stainless steel construction along with a CNC-machined 304 stainless steel flange that provides a smooth, unrestricted transition from the turbo to the mid-pipes. Every Mastermind Racing downpipe is handcrafted from premium SS304 stainless steel and backed by our Lifetime Warranty and No-Hassle Fitment Guarantee.
Product Features
- Handcrafted, TIG-welded 4.5″ 304-grade stainless steel construction
- Compatible with both RHD and LHD models – no modifications required
- Smooth-radius bends to reduce turbulence and maximize flow
- Fits OEM and aftermarket cat-back exhaust systems
- Power gains of 25–30 HP with proper tuning
- Mastermind Racing Lifetime Warranty
- Off-Road Use Only
Vehicle Fitment
- 2017–2022 G01 BMW X3 M40iX xDrive
- 2017–2020 G02 BMW X4 M40iX xDrive
