$595.00 USD
$595.00 USD










The MMX Performance Cotton Panel Air Filter is one of the easiest power-boosting upgrades you can make to an S55- or S63-powered BMW. The kit drops directly into the OE airbox in roughly 10 minutes (no airbox modification, no cutting, no fuss) and is fully washable and reusable, so it's a one-time purchase that stays with the car.
Each filter is built from MMX-developed cotton gauze media that removes the inevitable airflow restrictions of a standard paper panel filter. The result is a worthwhile increase in airflow through to the turbos, which translates to crisper throttle response, a more aggressive induction note, and meaningful power gains across the rev range. OEM-standards of design, quality, materials and construction mean the filter fits like a factory part and lasts like a factory part.
The kit is sold as a pair, which matters: S63-powered M5 and M6 cars use both filters at once (one per airbox, twin-airbox setup), while S55-powered M2 Competition / CS, M3, and M4 cars use a single filter (the pair gives one for now and one for the next service interval, or splits between two owners).
Easily returned to standard if you ever wish, and arguably the best panel air filter you can buy for these engines.
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.