Not exactly in Eastern PA but kinda in the vicinity of Central Jersey.
Kartronics (Chris or Brian)
299 South Main Street
Flemington, NJ 08822
(908) 782-1787
The perfectly installed my Z2, iPod adapter, Rear AND Front Cameras, extra subs, remote start, Viper security, integrated radar detector, active deer alert system, and even my dash/console/door trim.
These guys did in 7 days what would have taken me a year. Excellent knowledge and perfect installation.