Hi guys, I have been looking around for an s3 and have found one with 50k miles at cargiant (so car probably just done motorway miles). going to check it out, but have been reading the threads around here and it seems that if the MAF is on the way out then it can make the cars performance much worse. Am I correct in that the MAF is the mass air filter? How much is it to replace? Is there anything else I should look at while looking around the car. Thanks in advance guys.