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It will up the fuel cut and raise boost to 1.2 bar, but you will need to monitor fuel/air, and install knocklink so you can keep an eye on things, I had no probs with it and it pulled like jordan on a night out.
But I only recommend it on a uk car.
Cheers Nick...
ive got a ABC installed on my94 wrx only noticed the other day as i was putting an arf meter on it,the connectons to mine are on terminal 4 on block B43 think the uk ones a diferent? may be somebody else knows?...very easy to wire up anyway.the bleedvalve needs to be put in the vacume pipe on the actuator.make sure you use a boost gauge to set it up.