Alpha Competition - Decat Downpipe - BMW 240i G42 / 340i / 440i G2x B58 OPF

Alpha competitionAC-B58.2-DP-01

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This Alpha Competition Decat Downpipe is developed for BMW B58 models with OPF and offers a significant improvement in exhaust gas flow compared to the original downpipe. Thanks to the large diameter from 4" to 3", back pressure is reduced, resulting in faster turbo response, more power, and a more aggressive exhaust sound.

The downpipe is manufactured from high-quality T304 stainless steel and fully TIG-welded for maximum durability. For extra protection against heat radiation, a stainless steel heat shield is optionally available.

Advantages

• Reduced exhaust gas back pressure
• Faster turbo spool
• More power and torque
• More aggressive exhaust sound
• High-quality T304 stainless steel construction
• Handmade and TIG-welded
• Plug & play installation
• Lifetime warranty
• Optional stainless steel heat shield available

Technical specifications

• Type: decat downpipe
• Turbo side diameter: 4" (100 mm)
• Outlet side diameter: 3" (76 mm)
• Material: T304 stainless steel
• Production: handmade
• Welding: TIG welded
• Installation: straight fit

Compatibility

• BMW M240i G42 B58 OPF
• BMW M340i G20 / G21 B58 OPF
• BMW M440i G22 / G23 / G26 B58 OPF

NB

• Not suitable for the updated BMW M240i G42 produced from 05/2026
• This newer version features an extra pressure connection in the original exhaust system

• Alpha Competition decat downpipe
• Mounting material

Frequently Asked Questions

Does this fit all M240i G42 models?
No, not on models produced from 05/2026 with the new exhaust configuration.

Is software required after installation?
Yes, for optimal performance and to prevent error codes, ECU software is recommended.

What is the advantage of a decat downpipe?
Less back pressure, faster turbo response, and more power.

Is mounting hardware included?
Yes, all necessary mounting materials are included.

You have the right to cancel your order up to 14 days after receipt without giving a reason. After cancellation, you have another 14 days to return your product. You will then be credited with the full order amount, excluding shipping costs. Returns must be shipped with tracking. Return shipping costs are your responsibility.

This returns policy does not apply to business customers. For more information, please refer to our terms and conditions for business customers. See our general terms and conditions here.