Problem is I've been playing with it this morning and the only lag I notice is from a standing start or very low revs in gear. In second for instance already doing 3k revs and then stamp on the loud pedal it pulls instantly so still not sure what I'll gain. Much rather spend the cash on figuring out why it misfires when changing down to go round a roundabout (sorry you don't have them do you - think of a slow corner that keeps going
) its like its cutting out then runs fine again. This is a 2004 roadster manual.