My personal principle is:
Tuner which collected years of experience
in the active motorsport, have their price,
their empirical values (stability
and efficiency), opposite to the
"Chiptunern from the road" which in last years
mushrooms come out from the soil.
Under addresses you find the
address with telephone and fax number.
The direct linkt to the
respective tuner homepage
under LINKS Tuner.
Some people notice a large german tuner
is not aforementioned -
i have personal reasons
from my GOLF 1 GTI time.