Ok, probably getting ready to think about boost control, the car is an escort cosworth and I am in no way nostalgic in thinking I need to have air injectors, of in the case of the WR cars twin air injectors, so what is the options, something bleed off, fast solenoid that I can control, nice quick PWM.

How about one of these

http://www.ebay.co.uk/itm/3-Port-Ele...item2ecd67bcef

Good ? yes?

What have you used? (and did it work - please nothing manual)