See what I mean:
http://pettitracing.com/faq/compressor_factsheet.htm
Highlights:
-30 -80 additional horsepower and torque with only 5-8 psi boost
-Superb drivability and overall performance
-Reliable and easy to maintain
-Provide a kit that allows for a simple D.I.Y. installation, with easy to follow instructions
-Offer several stages and configurations to suit most budgets
-Use only the highest quality components
Stages:
Stage II System, intercooled, producing at wheel 265 hp @8500 and 185 lb/ft torque. @ 5500 with 7- 8 psi boost, this translates to 160 lb/ft of torque by 3500 RPM.
Stage I System, still under development, non intercooled producing at wheel 235 hp @8500 and 155 lb ft tq. @ 5500 with 4- 5 psi boost.
Stage III System, Hi Boost, still under development.