S TYPE is designed for street use; ideal for stock vehicles, lightly tuned vehicles, and for vehicles with stock replacement type turbines. The engine response under street driving and performance at a mid to high speed range are well-balanced.
(1) Inner Fin
1. Short type
Short type that the pitch is optimized for fin shape, for small and light to improve the cooling efficiency.
2. Triangular straight type
Triangular straight type for less pressure loss of air flow.
(2) Outer Fin (triangular louver type)
Cooling efficiency improved with louver because of the shorter length and angle of the fin.
Wide surface of louver make it more efficient in cooling.