List of Tuners

Porsche:
Ruf
http://www.ruf-automobile.de/en/en-index.php

Techart
http://www.techart.de/en.html

BMW:
Alpina
http://www.alpina-automobiles.com/en/

AC Schnitzer
http://www.ac-schnitzer.de/en/

Volkswagon:
Callaway
http://www.callawaycars.com/

Neuspeed
http://www.neuspeed.com/

Techtonics
http://techtonicstuning.com/

ABT
http://www.abt-sportsline.de/en/

Autotech
http://www.autotech.com/

Honda:
Neuspeed
http://www.neuspeed.com/

Mercedes Benz:
Brabus
http://www.brabus.com/