Product Overview
ITG ProFilter HMP-526 – BMW 335i E90/E91/E92/E93, Alpina B3 BiTurbo and 1M Coupe
HMP-526 is ITG’s direct-fit foam panel filter for the standard air box used on BMW’s twin-turbo 3.0-litre straight-six. ITG lists it for the Alpina B3 BiTurbo and B3 S (2008–2009, 360 bhp, N54B30A), the 335i E90/E91/E92/E93 from 2006 to 2010, the 335xi and 335is, the 1M Coupe (2011–2012), the Z4 sDrive35i/35is E89 from 2009 and the 535i E60/E61 from 2007 to 2010.
Why a foam ProFilter?
The N54 responds well to a free-flowing intake, and many owners want something that keeps flowing well on track days without moving to an open cone filter. The ProFilter keeps the factory air box, so intake temperatures and sensor readings stay as BMW intended, while the multi-layer foam traps dirt through its depth and can be cleaned and re-oiled.
- Shaped to fit the standard air box – no modifications
- Multi-layer reticulated foam made in Britain
- Pull handle for easy removal
- Washable and reusable
Specifications
The filter measures 285 x 250 mm including its handle. Power outputs listed by ITG range from 272 bhp (535i) up to 360 bhp (Alpina B3). See the full application list on the ITG HMP-526 product page.
Fitting notes
Unclip the air box lid, remove the paper element and clean out any leaves or grit. Seat the ProFilter so its edge sits evenly in the seal groove, then close the lid without trapping the foam. Some later 335i E9x models use the N55 engine, so check your engine code and ITG’s listed date ranges before ordering. Keep the foam oiled and clean it at service intervals. If you are improving charge-air flow at the same time, the related parts below cover the same N54 cars.
