Have an 02 1.8T Passat. Got chipped (GIAC) for my birthday yesterday . The tech told me that the software was the "learning" type and that it would take about 1 tank full of gas to complete its learning. The way the tech put it was that I should feel a noticable difference right away but it wouldn't reach its full power until the software had completed it's learning. I'm kind of bummed out because I really don't notice much of a power increase. I do feel a slight increase around 3500rpm but that's about it. It's just not the night/day difference that I was expecting (I've never driven in a chipped 1.8T so have nothing to compare it with). Also, I haven't taken it much above 4500rpm yet. Any thoughts - or am I just being impatient? Thanks.