Overview

The MST Performance BW-B5812 is a complete induction upgrade for the BMW B58 G-chassis platform, combining a high-flow cold air intake system with MST's turbo inlet pipe in one bolt-on kit. Engineered to address the two biggest restrictions in the factory induction path, this kit reduces intake air temperatures and improves turbo response from idle to redline.

Built specifically for G20/G21 M340i, G22/G23 M440i, G42 M240i, and related B58 G-chassis vehicles, the BW-B5812 delivers measurable gains for stock and tuned cars alike. Whether you're running pure stock, an OTS map, or a custom Stage 2 tune, this kit unlocks airflow potential that the factory plastic intake and restrictive turbo inlet simply cannot match.