i heard there isnt a wiring harness and u dont really need a turbo timer, need in mind i have a 2001 a4 1.8T, but does anyone have one hooked up, did it mess anything up computer wise, ect.... u tell me, i have one before i bought my car and was wonering if i should try n find someone to hook it up?

 

You can run a turbo timer fine, if you want directions they are on the greddy web site.