I'd like to know also about the upgraded alarm system. From what I've heard it adds a motion sensor, or something to detect breaking glass? Price I heard was approx. $500.00? Way too much, if that is true.

'07 HCH w/Nav, '04 Corvette Z16, '98 Corvette Pace Car, '04 Chevy Avalanche.
HCHII Mods: Tinted windows, PIAA 4150K Headlights, PIAA 004X Fog Lights,T/P F/R 48/46 nitrogen.