A JR supercharger isn't the greatest match for a ITR because of the low RPM character of the JR. if you're thinking about supercharging, Vortech mught be a better choice because it's higher RPM based which would match the characteristics of an ITR a little better. JR S/Cs tend to run out of ass at high RPM, and are really just passing air through instead of pressurizing it. It really depends on how well the supercharger is matched to the engine, etc... A JR S/C will give you a good boost in low RPM torque, but won't do much up high..