Does the apr ecu upgrade require chip soldering or is it a computer re flash via diagnostic port i looked at the apr site and it talks about chip and solder .I had a 2004 forester and got mrt to do reflash and no soldering so can some one confirm which way the polo gti is done and how they change the program do they have a extra button installed or is it done like the golf gti using the cruise control stalk button?