Djorge

Hello, I'm considerinng to buy an ECU of same p/n as mine (Bosch A6519002501) in order to tune it for a STG2 from celtic (UK based) by sending it by mail/courrier while I can keep my car running w/ its original setup - their representatives told me I'd need to first tune the "new one" to my car, before sending it to them - does any one know how that should be done? Cheers!