So I see people selling ECU's with stage XXX software already installed. Do you just pull yours out, install the loaded ecu and voila you have stage xxx installed? I called a local dealer and they said its not even possible to do so. They said you need to have a authorized dealer install the software and that only the B5 S4 platform is capable of ECU swapping. If I can buy a ECU with the software installed already for cheaper but cant even use it then how are people selling them and the buyers able to use them? I have an ECU with APR stage 2 lined up to purchase used for my 05 1.8t a4 from a member, can this just be plugged in and used or is the APR dealer just teling me it cannot so that I buy new from them?