BMW G20 G21 G22 G29 K&N 33-3136 Air Filter

K&N 33-3136 is a direct-fit, washable panel air filter for BMW G20 (3 Series), G21 (3 Series Touring), G22 (4 Series) and G29 (Z4) models with naturally aspirated and turbocharged petrol and diesel engines - including 318d, 320d, 320i, 330i, 330e, 420i, 430i and sDrive30i.

It slots straight into the factory airbox - no mods, no trimming. Flow gains are modest but real; filtration remains excellent. Ideal for fast-road use, track-day prep or simply extending service intervals.

• Washable and reusable for up to 100,000 miles
• Fits OEM airbox without modification
• Backed by K&N’s million-mile limited warranty