Fitted on '08 Mustang GT with Trinity 1000 and FlowMasters rear axle kit. It took just over 30 minutes from crate to car. No noticeable difference up to 5800 rpm. and by that I mean if you drive at a decent 45-60mph and then decide to drive. Kicking the pedal to the ground now has the added effect of nudging you back into place. I don't think this is the best way to level up Hole Shot if you're involved in drag racing. More like a poor man's NOS.