I have personally worked with quite a few National & International Tuners in Europe & America. Among few that offer their humble services to public
David Markert @ Markert Motor Works – Based around Lawrenceville Georgia, USA, Dave & mutual friend of ours have been a tremendous help in 2016 in resolving some fine tuning issues and developing a custom tune. Hes got a great deal expertise working with these cars on a daily basis.
Andreas Fekzen in Sweden @ Fekzen.se – who has helped with constant refinement in tuning it last year in 2015. Hes got some Chip Tunes, specially if you got older Pre OBD II cars produced before 1995.
Enda Wards from UK @ EndTuning – If you are in the UK, Enda may be your go to, the prices are just right and we have discussed a few things initially every now and then and found Enda to be quite helpful with some information I was after.
Gavin Ballers @ Hi Velocity – If you are in New Zealand and looking to pay for a comprehensive Dyno Tuning, then go to Gavin, His time maybe a bit expensive but he is the best BMW Tuner you will find in NZ.