I had powerchip do the programming on my '06 4.4. I live local, so I didn't have to remove anything, I just drove over to the shop.

I have a Dinan CAI, throttle body and exhaust. The mapping program they have didn't work with my aftermarket set-up. There was a dead zone between 2500 and 3000 RPM. I am not a mechanic, but it was either shutting down cylinders or choking off gas supply. I had to have the software removed. They refunded my money and offered to get it on a dyno to do some trial and error programming. I just wasn't comfortable with these guys taking my $65K vehicle for a week and flogging it on a dyno doing what if sceanrios.

They discount me $100 when I mentioned X5 World.