Hello, there are 1000-de suppliers of chip tuning sets…and everyone does (sometimes) something different….the one only changes the chip…the second buys a sports air filter…or even charge air cooler…and the third offers 3 different chip tuning sets….but what IS THE NON REALLY RECOMMENDED? Has someone had his own experience and can really recommend a manufacturer/supplier (Internet address ???) ? ..if yes, so…*grins*…because I am (at the point of view) its offer) really confused…even the prices range from 599 EUR …to over 2500 EUR…but what is really worth it and what is to be paid attention ? THANK YOU in advance for serious answers ! Ciao