Kenne Bell has been a player in the supercharger arena since 1991. Over the years, the company has been at the forefront of supercharger technology, and its new line of Big Bore twin-screw superchargers is no exception. The H- and S-Series superchargers are identical in construction and boost output, but that is where the similarities stop. "The challenge was to design two unique, ultra-efficient superchargers that use the least engine horsepower to pump the most air/boost at the coolest air temps in their designated boost range. I feel we met that challenge," explains Jim Bell, president of Kenne Bell Superchargers. The H-Series superchargers feature a redesigned discharge port shape that reduces air charge temperatures and parasitic loss. These compressors feature a 2.0:1 internal pressure ratio for improved efficiency at higher boost levels and are designed to operate in the 15-24 psi range. The S-Series superchargers feature a 1.4:1 internal pressure ratio and are ideal for the 6-14 psi range.