If you want the exact same Subaru engine Element Tuning runs in our "Unlimited" Time Attack STi, then look no further. Whether you want to make 400 whp or 800 whp this will have the biggest and fattest powerband your Subaru can have. This motor is setup to maximize HP from 4000 RPM to 8500 RPM with the addition of our "Big Valve" head package. Our Pro Comp Long Block starts with the Pro Comp billet CNC insert closed deck Short Block and adds Element Tuning Competition Valve Springs, BC 280 Camshafts, Valve Covers, 11mm High Flow Oil Pump, and Element Tuning's Big Valve Head modifications.