I unfortunately had a very different experience with MAS performance, so not only would I NOT recommend them I would NEVER use them again! I opted to have my Merc ML cdi, remapped by them, a chap came to my house (which was the only plus side to using them), completed remap and then vehicle failed to start. Ended up removing the ECU, taking the soldering iron to it, removing chips, testing them, replacing them, reinstalling ECU, several scratches of the head and several 'this has never happened before' recitations, realised he had actually knocked some of his setting on his laptop which mapped the ECU incorrectly! Then managed to sort it, in total approx 3-4hrs work! Wasnt convinced it was any different, he couldnt show me using his laptop that it was, but gave me assuarances that it had been mapped. Also couldnt provide me with a receipt, as he didnt have any to hand but that he would definately send one out to me, (wouldnt have normally wanted or asked for one,but wanted some comeback if the car developed problems due to his work). The car never did have any issues, the MPG were marginally better. Sold the car, have had the BMW 535d since, remapped to 350bhp by DMS, that sold, now am rnning the S4 but no plans to remap it....yet! Oh and am still waiting for my receipt, from over 2 yrs ago, as he refused to answer my mails or answerphone messages!
