I have it on my s1 and it is running gotech and its really if you have a bigger turbo like a stage 3 or t34 but must have a maram shaft preferable left handed, and the difference is it stops the lag so the car will boost upto 1 bar from 1500 rpm and then at 3500rpm or thereabouts the turbo will take over. when you back off the throttle or change gear it pops and fires through the exhaust like carzy, gotta be carefull in residential areas and the of the plods as its a defo section 59 noise act.
anti lag can be mapped but it can't be on closed loop lambda.