well our cossie was mapped by EA by the previous owner, ran like a bag of shit! would stall all the time...run stupidly rich in lower revs, used to eat plugs all the time, cold starting was a nightmare(could have been down to a head problem though)

then when the head was getting done it was found to have melted a piston then bodged backl together...also to add that their dyno massively overreads in most cases...we had a reading of 480 bhp which was said to be no more than 430 by another decent tuner after he looked at the map