Stage 2 Lightweight Flywheel for '92-'99 E36 3-series and M3, E34/E39 5-series with 6-cylinder M50-series motor PACKAGE 1 - WITH OEM-BMW-21-21-2-226-428 M5 Clutch - OEM BMW M5 clutch kit option is perfect for street cars, light track use up to around 375 hp or so. Experience quicker throttle response and faster acceleration at your command... 8.5lb unit works with '91-'93 E34 M5 clutch kit for reduced-noise operation. Unique features: CNC machined 6061-T6 aluminum, dowel pin hole enlarged like factory-fit, friction plate: replaceable, 1050 steel, balancing: 8000rpm, weight: 8.5lbs for ultimate racecar-style response, throwout bearing & clutch used: '91-'93 E34 M5 clutch parts required. Source: Made in USA. Fits all 1995-99 E36 6-cylinder 3-series, Z3 2.5/2.8 with M52 engine, M Roadster/Coupe (all), 1989-1995 E34 525i. Pressure plate,throwout bearing& clutch used: '91 - '93 E34 M5 parts required. BMW part # 21 21 2 226 428 (complete clutch kit)VERY IMPORTANT: some parts vendors have beensupplying the wrong clutch components. SpecifySachs part number KF777-01." Professional installation recommended.