Fitment Information Acura RSX (2002, 2003, 2004, 2005, 2006, 2007, 2008)  2.0L (6spd) Type S, K20 Honda Civic SI (2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011) 2.0L (6spd) Type S, K20 Specs & Features Warranty Policy: 90 Days Alignment Tool Included:  Yes, if applicable Disc Material: 4140 forged steel SFI Approved:    Yes Genuine Competition Clutch Product: Yes Brand new in the box Product Description Competition Clutch flywheels are made of 4140 forged steel and are a one-piece design. This helps significantly in reducing the chances of ring gear separation and friction surface warpage. All flywheels can be resurfaced. Flywheel weights vary from 8lbs to 18lbs depending on application. The lightweight steel flywheel (ST suffix) is recommended for naturally aspirated and/or street driven applications. This flywheel preserves low-end torque and driveability. Well-suited for Gravity, Stage 1 and Stage 2 clutch applications. The ultra lightweight steel flywheel (STU suffix) is recommended for forced induction  and/or track and rally racing applications. This flywheel is machined with less material to assist in quicker revving capabilities. Well-suited for Stage 3 and up clutch applications. These flywheels will work with ALL performance and stock clutch assemblies. Not all applications ahve the ST and STU versions available. Please verify before ordering. All flywheels are SFI certified. Redline360 sells only new, genuine and authentic Competition Clutch products.