1997 Bmw M340i Tuning For Downpipe Without Cel? The Best Upgrades The Motoring Den

Author Dalbo 18 Sep 2026

Learn how much horsepower a tuned m340i can make and what to consider when selecting a catted downpipe and ecu tune for performance and reliability. As for the hassle others mentioned, if you are going to bmw for service then you will only have to deal with. Upgrade your stock b58 downpipe to the mad b58 catted downpipe for more power, better sound, and guaranteed reliability without triggering a check engine.

The Best Downpipe Upgrades For The BMW M340i | Motoring Den

1997 Bmw M340i Tuning For Downpipe Without Cel? The Best Upgrades The Motoring Den

I'm looking to upgrade my bmw g20 m340i with a new downpipe and pair it with a muffler delete to enhance performance and sound Catless downpipe + an intake would be nice, the only downside is that you will get an engine light I could use advice on.

I have a 21 m340i and i'm currently looking at a few options for downpipes that wont throw a cel without a tune and pass emissions

I want a bit more sound from the car but i'm reluctant to spend thousands on exhaust parts which only give sound improvement so i am looking at replacing the downpipe with a 200 cell. In this video, we install a catless downpipe on my 2021 bmw m340i (b58) and take it for a spin to hear the insane turbo noises and improved performance If you're thinking about doing this mod to.