Hey guys! I have just purchased a crossfire as my new project car and I was wondering, If I make a custom turbo for the car can upsolute, karmann, and all those ecu tuning companies tune for that? OR can they only tune when the car is n/a?

Also, which one is the cheapest of them? (to make the ecu reflash).

Thanks!
Tito @ TR
www.tr-performance.com