Right, I want to build a system with wich I can spray coolant in the exhaustmanifold or downpipe of a car.

It has to be switchable i.e. arm/disarm and be operated via a pushbutton.

I know I'll need a tank to hold the coolant (preferably in the boot), a pump with enough flow to pump enough coolant and associated lines/connectors, as well as one of multiple nozzles wich I can fit inside the manifold or downpipe.

I am thinking that maybe a waterinjection system would be good enough, can anybody advise me on good systems?