Downpipe BMW M340i G20-G21 B58 – InoxPower EVO-RACE

The InoxPower EVO-RACE downpipe for BMW M340i G20-G21 B58 engine is a handcrafted high-flow de-cat pipe made of AISI 304 stainless steel, TIG-welded and hand-finished.
Designed to maximize engine performance and racing sound, it is also compatible with OEM OPF-equipped BMW models.

Compatibility

✔ BMW 440i B58
✔ BMW M340i B58
✔ BMW M140i B58
✔ BMW M240i B58

Why choose an InoxPower downpipe

The downpipe (also called decat or de-catalyzer) connects the turbocharger to the exhaust system.
Replacing the restrictive OEM catalytic converter with a free-flow sports version allows exhaust gases to exit faster, delivering immediate benefits:

-Power and torque increase (+10-12 % even on stock ECU)
-Lower turbo temperature and improved reliability
-Sharper throttle response
-Deeper and more aggressive racing sound

With a stock or tuned ECU, the InoxPower EVO-RACE downpipe is an essential upgrade to unlock extra performance without overstressing the engine.
When paired with an ECU remap or an upgraded turbocharger, it further enhances power gains and boost efficiency.

Technical specifications

-Brushed AISI 304 stainless steel construction
-TIG-welded by hand for maximum strength
-Direct fit for OEM or aftermarket exhausts
-Made in Italy craftsmanship
-Plug-and-play installation, no structural modification required

Main benefits

-Noticeable increase in power and torque
-Faster throttle response
-Reduced exhaust gas temperature
-Richer, sportier exhaust tone
-Longer turbo lifespan thanks to lower back-pressure

Important notice

This product is intended for racing and track use only.
Not approved for public-road use.
We always verify compatibility with your OEM system before purchase.
InoxPower declines all responsibility for improper on-road use.

Buy your BMW M340i G20-G21 B58 Downpipe

Experience the handcrafted quality of InoxPower — real performance, refined design, and unmistakable sound.
 Available online at www.inoxpower.com in the EVO-RACE version for BMW M340i G20-G21 B58.