Aaddzz is right the td04 isn't even that laggy set up right, your probably running an actuator so your boost is tailing off higher up the revs...? Ideally external wastegate will be the way to go to hold the boost that much better but cash wise by the time you buy a hybrid set up it's some what cheaper going td04, wouldn't underestimate those saxo's some of them are surprising fast with no lagg all about the timing with these turbo's as above make sure your in the right gear haha