this should be interesting, i have the alpine kit and an 11/09 prod car with the base sound.
what should i look out for after the install?
edit:
i found the install PDF for the new alpine upgrade. there are modified retrofit instructions from 7/09 that cover how to connect the 684 kit to the newer sound systems. looks like the only difference is where the wires are run in the post 3/09 cars.
the new kit doesnt require cutting, but does require coding.
http://www.docstoc.com/docs/19529573...n-Instructions
you splice into the wiring harness under the seat instead of in the sill.