type R

Start with the GS-R motor then add:

Large-diameter throttle body and single-port intake manifold to maximize high-rpm engine efficiency
Hand-polished intake ports to improve engine airflow
Increased duration higher-lift camshafts for improved engine breathing
12-percent lighter intake valves to extend engine rev range by 200rpm
High-compression (10.6:1) low friction pistons
Forged-steel crankshaft with eight counterweights to reduce vibration at high rpm
Large diameter free-flow intake and exhaust systems
Aluminum oil cooler maintains optimum engine-oil temperature