its nothing you have to believe. infact you dont have to believe but just dont put your money against one with a chip unless you are planning to lose. these cars are one car that get my respect in that way of being able to add one thing that might cost 600 dollars and gain that much power. I'm not an audi or vw freak so i dont know exactly what model all i know is that the guy i talked to said that it was a quatro. and his buddy in a 1.8t vw golf had a chip also and was turning consistent 13 sec et's