Valvetronic Designs BMW GEN3 B58N 400 Cell Catted Downpipes
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: BMW M340i (G20), M440i (G22), M240i (G42). 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.
- Free US shipping over $250
- 30-day returns on unused parts
- Fitment help before you buy
The Gen 2 B58 (B58N) turbocharged inline-6 is one of BMW’s most capable modern engines, known for its immense tuning potential and smooth power delivery. However, factory catalysts restrict exhaust flow and limit turbo efficiency. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, improve turbo spool characteristics, and unlock a deeper, more aggressive exhaust tone — all while maintaining emissions compliance standards. This upgrade lays the foundation for increased performance on both stock and tuned vehicles. Why Upgrade to 400 Cell? EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards. Faster Turbo Spool: Reduced restriction enhances responsiveness and mid-range torque. Increased Tuning Headroom: Supports higher boost levels compared to restrictive factory catalysts.
Fits: BMW M340i (G20), M440i (G22), M240i (G42). Confirm your exact car with us before ordering.
Brand: Valvetronic Designs · Part #: BMW.B58.GEN3.FF.400C.BR
For off-road / competition use only. Not legal for use on public roads in the United States, including California.
BMW M340i (G20), M440i (G22), M240i (G42). Confirm your exact car with us before ordering.
| Model | Chassis | Years | Engine | Fits |
|---|---|---|---|---|
| M140i | F20/F21 | 2016–2019 | Gen 1 B58 | |
| M240i | F22/F23 | 2016–2021 | Gen 1 B58 | |
| 340i | F30/F31/F34 | 2016–2019 | Gen 1 B58 | |
| 440i | F32/F33/F36 | 2017–2020 | Gen 1 B58 | |
| 540i | G30/G31 | 2017–2019 | Gen 1 B58 | |
| 740i | G11/G12 | 2016–2019 | Gen 1 B58 | |
| X3 M40i | G01 | 2018–2019 | Gen 1 B58 | |
| M340i | G20/G21 | 2019+ | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021+ | Gen 2 B58 (TU) | |
| M240i | G42 | 2022+ | Gen 2 B58 (TU) | |
| Z4 M40i | G29 | 2019+ | Gen 2 B58 (TU) | |
| GR Supra 3.0 | A90/A91 | 2020+ | Gen 2 B58 (TU) | |
| 540i | G30/G31 | 2020–2023 | Gen 2 B58 (TU) | |
| 740i | G11/G12 | 2020–2022 | Gen 2 B58 (TU) | |
| X3 M40i | G01 | 2020+ | Gen 2 B58 (TU) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Free US shipping on orders over $250.
- 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.
Pairs well with
CTS Turbo 4.5" High-Flow Cat - BMW B58 (all generations, RWD and xDrive)
Scorpion 5" Downpipe with High-Flow Sports Cat - BMW B58
Active Autowerke GESI Catted Downpipe - BMW B58N M340i / M440i (2025+)