The ALCO Filters MD9422 air filter is designed for the Audi TT Roadster 8N9 with a 1.6 engine, 1,595 cc and 74 kW, or a 1.8 T engine, 1,781 cc and 132 kW. It is suitable for models from 1999–2006.
- Type: Car air filter
- Height: 48 mm
- Length: 365 mm
- Width: 186 mm
- Equivalent codes: VAG 1J0129620, HENGST FILTER E301L, KNECHT LX684, MANN-FILTER C37153, PURFLUX A379