raj -

wot = wide open throttle.

afr = air fuel ratio

chris69 - it need'nt be expensive to go down the external wastegate route. i did this with mine as i was fed up with busting rads with my actuator, but the added bonus is i get no peaking it just holds boost all the way through. i did my whole set up for £100 but can be done for even less. oh and the screamer pipe noise is awsome if you wanna run it that way