The problem has been identified , i lost my temper with these guys when i went to get the bumper painted again thanks to another woman drive rear ending me - they painted it the wrong color , on top of tat 5 attempts and they have still not got the alignment right - anyway sent a stinker to Fiat and just daybefore the car was examined by senior technicans and a boost pressure problem was identified. Associated parts have been ordered and work should get done in about a weeks time. However i do not have enough information on what exactly they will change and what exactly the problem is , Fiat is being as vague as they possibly can be. What was clear was that the boost was coming on late - at about 2500 RPM and they mumbled something about RPM's free falling ( whatever that means) : in fact would love it if someone could throw some light on this. Hope it goes smoothly.