Clutch Masters 00-00 BMW 323 2.5L / 01-02 BMW Z3 3.0L / 01-05 BMW 330 3.0L 5 Sp / 325CI 2.5L E46 / 3

6061 T6 BILLET ALUMINUM: Two-piece unit featuring a high carbon steel replaceable friction surface. SFI Certified. Clutch Masters Flywheels are designed and tested to ensure the safety and quality of every flywheel. Years of R&D has given us the knowledge and firsthand experience to choose wisely the best material to manufacture flywheels that will surpass your expectations. Depending on the application, the majority of Clutch Masters flywheels are made from 6061 T6 Billet Aluminum, 1045 or 4140 Billet Steel. Clutch Masters Flywheels are SFI Certified meeting performance standards for the automotive and motorsport industry. Benefits of a Clutch Masters Light Weight flywheel: Light-weight for improved performance and Quicker Rev’s. (Aluminum Flywheels) Consist of a replaceable heat shield (friction surface), eliminating need to resurface flywheel. Reduces turbo "lag" in turbo-charged engines. Increased supercharger efficiency due to less drag on the crank. Improved mid-range torque in naturally aspirated engines. CNC Machined and balanced. SFI Certified. Replacing your OEM flywheel with a light weight flywheel may cause gear noise or a vibration that may not be suitable for everyone. The lighter the flywheel the more gear noise will be produced. Depending on the application Clutch Masters usually recommends Steel flywheels rather than Aluminum flywheels since Aluminum flywheels will cause more gear noise. Aluminum flywheels are usually only recommended for race applications looking to have the least amount of weight as possible. A light weight flywheel may affect the life expectancy of a clutch kit depending on the application. Going from a Dual-Mass Flywheel (DMF) to a Single-Mass Flywheel (SMF): A Dual Mass Flywheel (DMF) is a flywheel in two concentric parts or two facing flywheels stuck together with flexible compound to damp down transmitted vibration and gear rattle for the gear box. Many newer model vehicles now come standard with a factory DMF. Many times enthusiast choose to replace a DMF with a SMF and here is why: DMF’s tend to be more expensive than a SMF. DMF’s are not designed to be resurfaced like conventional SMF. DMF’s usually weigh 30+ lbs depending on the application which will cause unwanted turbo lag. DMF’s cannot withstand a high rate of abuse and may fail under spirited driving. Benefits of switching to a SMF: Reduced mass equals increased acceleration. Reduces turbo "lag" in turbo-charged engines. Increased supercharger efficiency due to less drag on the crank. Improved mid-range torque in naturally aspirated engines. SMF are able to be resurfaced and can be reused. Clutch Masters offers Aluminum or Steel SMF depending on the application. We recommend you replace your DMF with a Steel SMF if the vehicle will be driven on the street since it will produce less noise and will be more pleasant to drive on the street compared to an Aluminum SMF. Aluminum flywheels are only recommended for race applications looking to have the least amount of weight as possible. By replacing a DMF with a SMF you may experience gear rattle and a vibration that may not be suitable for everyone. SMF may also reduce the life expectancy of a clutch kit depending on the application.