I think youd definitely year about exploding clutches on SAU. Especially the big boys, exedy, nismo, npc, os.
Anywho, you will need a twin for 450. It would be 10000000000x nicer to drive than a unsprung clutch. Imagine taking a sledgehammer to your gearbox with every gear change. That is what 4500lb clamp load sounds like haha.
Go nismo or NPC. Both have good rep