My friend has an 03 Mach 1 with a NX 150 shot on it. He powershifts the hell out of his car on motor, and on spray. We he did it on spray he destroyed the input shaft. Is there an controller that kills the spray when the clutch is depressed, but the throttle still remain open?

 

Just set the window switch to stop spraying just before your shift point.

 

Or, you could mount up a WOT swich under the dash so that the clutch petal arm would contact it. If you have a 3 post WOT switch you could wire it up so that it was on all the time, and off only when the clutch was pressed. Seems like a cheap simple solution.