I've been contemplating a gear change (3.73) once my GT500 arrives but a couple of ?'s have come to mind...1. Will my warranty be voided? and 2. Here in CA, I believe I will have to get it smog checked after it's 5th birthday...the inspection stations use a dyno to check emissions at different RPM's and in different gears...I'm wondering if the ratio change will have any effect on the final emission numbers? Thanks...