Hemi-it is, Scott Smith Harms; Think of a Clutch tamer on the same lines as a screen door piston. Internal pressure release can be changed with a simple turn of an adjusting screw. They are a universal fit. Very simple, excellent idea to control the launch. The problem that I see is that dropping the clutch pedal on the launch is a completely different set of circumstances than upshifting during the run. The timeframe that is necessary for a gear change is not the same as the time frame to get a car to move from a dead stop. The Clutch Tamer release time is consistent during the run. My opinion is that it would be too long between shifts and might prematurely burn out the clutch on a high hp car. And if using a clutchless trans, there is no cushion for the trans on the gear shifts if not using an adjustable clutch.