As I mentioned in my intro thread, I put in a factory order for a gunmetal pearl/black GT on the weekend. I've owned a lot of sports cars, always wanted a Viper. Last week, I test drove a '13 twice. Tight fit in the cockpit (6'1", 250), ingress and egress is interesting. Loved the interior. Quiet exhaust note until you tip into the throttle, then raucous sound. May I ask for advice on a few issues:

1) With my height, I'm looking at the bottom of the headliner and difficult to see the colours of traffic lights when close up. Is it realistic to lower the seat an inch or so?
2) I've heard there is a long build wait. I phoned Dodge, and they told me my best source was the dealer. I await a response. Does anyone know if there is an objective way to find this out? I'm in Canada.
3) I'm coming from a Shelby GT 500. Very fun car, but squirrely handling if cool and/or wet. Does the Viper handle more predictably?
4) Is Nav standard on the GT for this year. I've looked at the literature which seems a little ambiguous on this?

Thanks for any help.