Dinan Drop-In Air Filter - BMW G22 430i

Factory airbox filters sacrifice flow for longevity — a reasonable trade for the OEM, but not the right call for a performance-oriented build. Dinan's drop-in air filter for the G22 430i increases airflow over the stock paper element without any modification to the airbox, intake plumbing, or tune, making it one of the simplest improvements you can add to the engine bay.

The filter uses a multi-layer oiled cotton gauze media with greater surface area and lower restriction than the OEM paper element, allowing the B58 engine to breathe more freely across the RPM range. It's a direct OEM-size replacement — drops in where the factory filter sits and seals against the same airbox surfaces. Washable and re-oilable for long service life, eliminating the recurring cost of replacement paper filters.