Valvetronic Designs BMW G8X M3 / M4 400 Cell Catted Downpipes
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: BMW S58: M3 (G80/G81), M4 (G82/G83). Confirm your exact car with us before ordering.
For off-road / competition use only. Not legal for use on public roads in the United States, including California.
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- 30-day returns on unused parts
- Fitment help before you buy
The BMW G8X M3 and M4 represent the next evolution of M performance, powered by the highly capable S58 twin-turbo inline-6. While factory catalysts prioritize restriction and sound suppression, our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce exhaust backpressure, enhance turbo efficiency, and unlock a sharper, more aggressive exhaust character — all while maintaining emissions compliance standards. This upgrade maximizes the performance potential of the S58 platform without compromising drivability. Why Upgrade to 400 Cell? EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust flow while maintaining compliance standards. Improved Turbo Response: Reduced restriction enhances spool speed and mid-range power delivery. Enhanced Exhaust Character: Deeper tone with more defined turbo acoustics and sharper high-RPM presence.
Fits: BMW S58: M3 (G80/G81), M4 (G82/G83), M2 (G87). Confirm your exact car with us before ordering.
Brand: Valvetronic Designs · Part #: BMW.G8X.M2.M3.M4.FF.400C.BR
For off-road / competition use only. Not legal for use on public roads in the United States, including California.
BMW S58: M3 (G80/G81), M4 (G82/G83). Confirm your exact car with us before ordering.
| Model | Chassis | Years | Engine | Fits |
|---|---|---|---|---|
| M3 | G80/G81 | 2021+ | S58 (BMW M) | |
| M4 | G82/G83 | 2021+ | S58 (BMW M) | |
| M2 | G87 | 2023+ | S58 (BMW M) | |
| X3 M | F97 | 2020–2024 | S58 (BMW M) | |
| X4 M | F98 | 2020–2025 | S58 (BMW M) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
- Unused parts can be returned within 30 days. Some items are marked no-refund in their description.
Full details are on our shipping and returns page.
Guides for this part
S58 Downpipe Install: G80 M3, G82 M4, G87 M2 and F97/F98 X3 M/X4 M
The S58 has two turbos, so you're swapping two downpipes, two turbo gaskets and four oxygen sensors. The job is done mostly from underneath. You drop the underbody trays and the center brace, support and unbolt the mid p
BMW S58 Mods Guide: M2, M3, M4, X3 M and X4 M Upgrades in Order
On an S58, start with a tune and cooling. These cars make a lot of power stock, and heat is what holds them back on hot days and back-to-back pulls. Next come downpipes and a tune built for them, then fuel: an ethanol an
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