you can hear the system injecting the nitrous when it shoots...the sound is nice....and you can make it shoot at 3/4 throttle if you would like...it is your choice when it goes off...you juss position the switch on the thottle body area nad put the lever in there to the pt where it will go off at 3/4 rather than full...you can also position it under your gas pedal so it goes off b4 u press all the way down from what the installation guy was telling me...i am takin piks tomorrow and will have them up in a few days prolly
