a few ive heard are as follows

a porsche went there to be chipped they dropped the ecu on the battery and frazzled it

a renault 5 was being tuned by them they put it on the rolling road and blew it up because they wound the boost out to much and still charged him for it

a lad went down there his exhaust was a bit loose they tightened it and tightened it and snapped the bolts off the block again charged him for it

my mrs used to work there she has quite a few storys from there