$4000 for turbos: GT2835s, TD06S... $1000 for injectors $1000-1500 for ECU and fuel management $2000+ for exhaust manifolds, downpipes $400 for fuel pump, regulator $1500 for cams, cam gear $1000+ for clutch $1000 for intercoolers $500-1000 for gauges $250 for gaskit $1000 for pistons $1300 for rods Need I go on? I think it basically need about $20000 in parts to reach 800hp and beyond of course reliably.