A good qestion really as its a very important thing to get right if your having your car tuned up?!
last thing you want is a holed piston due to detonation due to improper mapping
so who have people used and with what success??
for me it will have to be a diesel tuner, a reputable one preferably!
i have heard of companies like 'birds' and 'DMS' and have been led to believe they are 'bmw' tuners is this correct?
where are they and do they do the diesel?
thanks
carl