I have had all my cars remapped, I have used chip boxed and they didn't work well. I am pro-remapping because if it custom tuned for your car, then you can really get all ponies out of it. I have used good tuners, none of them failed me...and I have yet to worry about reliability. custom remaps are the way to go with the RIGHT tuners, not a new kid who just got a cable and will fiddle with an OTS map and call it custom remap.