i would like to add a 4 channel amp running front speakers and sub, if anyone can help i would to know how to connect the amp to the integrated head unit cheers carlo.

You'll need either:

- an amp with high level inputs (just hook up the speaker wires into the amp)
- line converters (converts the speaker wires into RCA connections, then you can use any amp)
- modded ICC with RCA outputs (then use any amp)

(1 and 2 are the easiest options).

Then run power to the amp, speaker wire back to the doors, and add a boxed sub.

Easy.