The paper filter in your factory airbox does its job, but it was chosen to last a service interval, not to flow. Every time you service it you throw it away and buy another. There is a better option that drops into the same box and never goes in the bin.
The Dinan High Flow Drop-In Air Filter is a direct replacement for the factory element on the BMW G20 3 Series, G22 / G23 / G26 4 Series, G42 2 Series and G29 Z4. Four layers of oiled cotton gauze give better flow and less pressure drop than the stock media, so the engine does not have to work as hard to pull air. It fits the stock airbox with no cutting, no tune and no changes to the intake plumbing.
Why a Dinan High Flow Drop-In Air Filter
This is the simplest way to put a Dinan part under the hood of a B46, B48 or B58 car. The filter measures 275mm x 234mm x 38mm and replaces BMW part numbers 13718635102, 13718580427, 13718580428 and 13718580429, so it seats and seals exactly where the factory element does. The media is washable and reusable while keeping excellent filtration, which means one filter can outlast the car's ownership instead of being replaced at every service.
Worried about emissions or your warranty paperwork? Dinan classifies this filter under Emissions Code 2: legal for California and Federal emissions-controlled vehicles as a direct replacement part. No CARB Executive Order is needed. Dinan part number D401-0046. Sold by AutoTecknic, an authorized Dinan dealer.
What's Included
- 1 x Dinan High Flow Drop-In Replacement Air Filter
Key Features
- Four-layer oiled cotton gauze media
- Better flow and less pressure drop than the stock paper element
- Washable and reusable
- Direct drop-in fit in the factory airbox, no tune required
- 275mm x 234mm x 38mm, replaces BMW 13718635102, 13718580427, 13718580428 and 13718580429
- Emissions Code 2: legal in California and all 50 states as a direct replacement part
Vehicle Fitment
Fits the stock airbox on the following B46, B48 and B58 models:
- BMW 3 Series / G20 Sedan (2019-2026): 330i, 330i xDrive; M340i, M340i xDrive (2020-2026)
- BMW 4 Series / G22 Coupe and G23 Convertible (2021-2026): 430i, 430i xDrive, M440i, M440i xDrive
- BMW 4 Series / G26 Gran Coupe (2022-2026): 430i, 430i xDrive, M440i xDrive
- BMW 2 Series / G42 Coupe (2022-2026): 230i, 230i xDrive, M240i, M240i xDrive
- BMW Z4 / G29 Roadster (2019-2026): sDrive30i, M40i
Not for cars with an aftermarket intake, or for the S58-powered M2, M3 and M4.
Installation Notes
A five-minute job with basic hand tools. No tune, no coding and no modification to the airbox.
- With the engine off, open the factory airbox lid.
- Lift out the factory paper filter and wipe any debris from the airbox.
- Drop the Dinan filter into place, making sure the rubber edge seats evenly all the way around.
- Close the airbox and secure the lid.
