Competition Clutch K-Series Flywheel RSX TSX Civic Si

The Competition Clutch K Series Lightweight Flywheel is built for Honda and Acura K-series cars where you want quicker throttle response without turning the car into a pain to drive. It’s a smart Honda Civic Si flywheel upgrade or TSX flywheel upgrade if you daily the car, hit backroads, and maybe see the track now and then. Think RSX Type S performance flywheel feel, but still friendly in traffic.

This Competition Clutch flywheel for Civic Si and RSX uses 4140 forged steel in a one-piece design for strength, heat control, and long service life. 4140 holds up much better to repeated heat cycles than cast or multi-piece setups, so you’re less likely to see hot spots, warping, or cracking when you’re leaning on it. It’s a solid match for spirited street use and occasional track days.

This isn’t an ultra-light, race-only flywheel that stalls if you look at it wrong. It drops rotational mass enough to let the engine rev quicker, sharpen throttle response, and recover faster between shifts, but still keeps enough inertia for normal low-speed driving. You get that “eager” K-series feel without killing smooth takeoffs or making stop-and-go traffic annoying.

The flywheel works with Competition Clutch Gravity, Stage 1, and Stage 2 clutch kits, so you can run it on anything from a mild street build to a more serious naturally aspirated setup. If you’re pairing a Civic Si K Series clutch flywheel combo or putting together an Acura RSX base clutch flywheel package, it’s an easy match. Multiple weight options (including RSX K Series Lightweight Flywheel and Sport Flywheel TSX 2008 style setups) let you pick how aggressive you want the engine response to feel.

Every unit comes SFI certified, so you’re running an SFI certified flywheel on your RSX, TSX, or Si that’s been tested for high RPM abuse. That matters when you’re spinning a durable RSX Type S flywheel or Race Flywheel Acura TSX build north of 8,000 rpm and want to know it’ll stay in one piece.

Key Characteristics

• Material: 4140 forged steel
• Construction: One-piece for durability and thermal stability
• Weight options: Around 8 lbs to 18 lbs, depending on configuration
• Clutch compatibility: Competition Clutch Gravity, Stage 1, and Stage 2 (great Stage 2 flywheel Civic Si combo)
• Certification: SFI approved for high RPM use

Vehicle Fitment

• 2002–2006 Acura RSX (Acura RSX base clutch flywheel fitment)
• 2002–2006 Acura RSX Type-S
• 2004–2008 Acura TSX
• 2006–2011 Honda Civic Si
• 2006–2011 Honda Civic
• 2002–2005 Honda Civic Si
• 2001–2005 Honda Civic

This Competition Clutch K Series Flywheel is for drivers who want sharper response, cleaner shifts, and dependable manners on the street. Install it correctly, follow proper clutch break-in, and you’ll get a K Series Lightweight Flywheel RSX / TSX K Series Flywheel setup that feels noticeably more alive without turning your car into a chore to drive.