Clutch Masters FX500 Clutch Kit w/Steel Flywheel for the Scion FR-S / Subaru BRZ offer a holding capacity of 200-400% over stock and utilize a solid hub for fast engagement. This clutch is not recommended for cars that see any street driving. It is a unsprung style disc that will yield an extremely hard and quick clutch engagement with no slippage. This is the perfect clutch for full race or drag modified cars that have upgraded gear sets only. This kit would be nearly impossible to drive on the street, so please be sure you do not purchase this kit with daily driving intentions. The 6-puck kit will dissipate heat better than the 4-puck version, but the 4-puck can handle a little bit more power.