aFe 31-10050 Magnum FLOW Pro DRY S Air Filter for 89-93 BMW 535i / 87-92 735i

Vehicle Fitment

• 1989-1993 BMW 535i (E34) - L6-3.5L (M30)
• 1987-1992 BMW 735i / 735iL (E32) - L6-3.5L (M30)
• 1989 BMW 635CSi (E24) - L6-3.5L (M30)

Fitment Notes

• This filter replaces OEM BMW air filter part numbers 13721707021 and 13721714952.
• Fits models equipped with the BMW M30 B35 inline-six engine (3.4L displacement, factory-badged as 3.5L).
• The E34 535i was produced from 1989 through 1993 (US market), after which the 535i nameplate was discontinued in favor of the V8-powered 530i and 540i.
• The E32 735i/735iL used the M30 inline-six through model year 1992; the 1993+ E32 740i/740iL transitioned to the M60 V8 and does NOT fit this filter.
• The 1989 E24 635CSi is the final model year of the E24 6 Series and shares the same M30 airbox as the E34/E32 M30 applications.
• Does not fit the 1989-1993 E34 M5 (S38 engine), E34 540i (M60 V8), E32 750iL (M70 V12), or any E34/E32 models with four-cylinder or diesel engines.
• This is a direct OE drop-in panel replacement for the factory airbox - no modifications required.

Features

• Pro DRY S Filter Media: Three layers of progressively finer oil-free synthetic media deliver improved filtration efficiency with no oiling required - ideal for convenience-focused maintenance on legacy BMW platforms.
• Oil-Free Design: Requires no filter oil during cleaning or reinstallation, eliminating any risk of MAF sensor contamination on airflow-metered M30 applications.
• Outflows the OEM Paper Element: Engineered to deliver improved airflow over the stock BMW paper filter, supporting better throttle response and engine breathing from the M30 inline-six.
• Rounded Open Pleat Design: Evenly spaced, rounded pleats maximize usable filter surface area for increased flow and greater dust-holding capacity versus the factory unit.
• Progressive Bump Seal: Pliable urethane sealing surface conforms to the factory airbox housing for a tight, gasket-free, leak-proof fit that consistently returns to its original form after removal and reinstallation.
• Full 360-Degree Urethane Housing: Constructed with 100% polyurethane on all four sides for proper OE-style panel fit, long-term structural integrity, and resistance to repeated engine bay heat cycles.
• Washable and Reusable: Designed for multiple cleaning cycles using aFe POWER Cleaner - no re-oiling needed after washing, eliminating the ongoing cost of disposable OEM paper replacement filters.
• Does Not Require a CARB EO#: This filter is emissions-legal in all 50 U.S. states and does not affect CARB compliance.
• Limited Lifetime Warranty: Backed by aFe POWER's limited lifetime warranty covering materials and workmanship under normal use and proper maintenance conditions.

Specifications

• Filter Type: OE Drop-In Panel Replacement
• Filter Media: Pro DRY S - 3-layer progressive oil-free synthetic
• Frame Construction: 100% polyurethane, full 360-degree boxed urethane housing (all four sides)
• Seal Type: Integrated urethane progressive bump seal
• OEM Part Numbers Replaced: BMW #13721707021, #13721714952
• Compatible Engine: BMW M30 B35 inline-six L6-3.5L (3.4L actual displacement)
• Emissions: Does not require a CARB EO# - 50-state legal

Included Components

• 1x aFe Magnum FLOW Pro DRY S OE Replacement Air Filter (PN: 31-10050)

Product Description

The aFe POWER 31-10050 Magnum FLOW Pro DRY S Air Filter is a direct OE drop-in panel replacement engineered for BMW's M30 B35 inline-six platform, covering the 1989-1993 E34 535i, 1987-1992 E32 735i and 735iL, and the 1989 E24 635CSi. All of these vehicles share the same factory airbox design and use the M30 engine - an engine celebrated for its long-stroke, free-revving character and the backbone of BMW's flagship lineup during this era. The 31-10050 replaces OEM filter numbers 13721707021 and 13721714952 and seats directly into the stock airbox with no modification required. Constructed with a full 360-degree polyurethane frame and three layers of progressively finer oil-free synthetic Pro DRY S media, this filter outflows the factory paper element while maintaining excellent filtration for everyday street use.

The oil-free Pro DRY S media is particularly well-suited for the Bosch airflow-metered M30 engine, where oiled filters can pose a risk of contaminating the air mass sensor. Because no re-oiling is required after cleaning - simply wash with aFe POWER Cleaner, rinse, dry, and reinstall - service intervals are simplified and the risk of MAF-related driveability issues is eliminated. The integrated urethane bump seal conforms to the factory housing for a secure, leak-free fit every time, and the urethane frame maintains its original molded shape through repeated heat cycles and cleanings.

For owners maintaining the E34 535i, E32 735i/735iL, or E24 635CSi, the 31-10050 replaces the recurring cost of OEM paper filter replacements with a single lifetime investment. It is 50-state legal, requires no CARB EO#, and is backed by aFe POWER's limited lifetime warranty. Buyers should confirm their specific chassis and engine code before ordering - this filter is specific to M30-equipped models and does not fit the E34 M5 (S38), E34 540i (M60 V8), E32 750iL (M70 V12), or any four-cylinder or diesel E34/E32 variants.