The AYREST 1421021 is a high-capacity Primary Magnum RS air filter engineered to handle the extreme intake demands of Scania DSI series engines and heavy-duty industrial machinery. In high-load environments like mining and forestry, air intake purity directly dictates the lifespan of your turbocharger and internal combustion components. Microscopic dust particles and moisture can cause catastrophic turbocharger blade erosion and cylinder liner wear.

By integrating specialized hydrophobic media with a geometric pleat design, the 1421021 solves the industry's most common pain points: intake resistance and moisture-induced collapsing. This filter maintains ultra-low airflow restriction even when operating in humid, foggy, or salt-spray coastal environments, ensuring your engine breathes freely to maintain maximum horsepower and fuel efficiency.

On-Highway Logistics (Scania V8/Diesel):
Fully optimized for DSI11, DSI12, and DSI14 engines. Fits heavy trucks and tractor units: R144, R164-480/580, R500 (Euro 3/4), R560 (Euro 4/5), R580, R620, T164, T500, T580.

Heavy-Duty Mobile Crushers (Wirtgen/Kleemann):
Essential for MC125Z, MF14, MR100R/Z, MR110Z EVO, MR122Z, MR130ZH, MR132R, MRB1302V, MRB1522 units operating in high-dust quarrying environments.

Forestry & Industrial Power:
Supports Bruks 805CT chippers, Himoinsa HSW500 Gensets, Pezzolato 1000/1000 wood chippers, and Krupp Concasseur systems.