Hello,

I have a manual e39 520D with M47 (136hp) vp44 inection pump. And I would like to tune it I dont really understand much of it and am scared to do it wrong. I just changed the vp44 pump it has lasted 260k km and replaced it by a refurbished one. I now have done about 5000 km with it and would like to add a little power while keeping the car reliable. I really dont know much about tuning and dont trust companies that can make a tune in 30min after sending the files. Could someone help me ?

Thanks