Hi I have three questions;

1. I will install a amplifier for after market radio. How can I bring to inside a power cable from engine compartment?

I couldnt find any suitable hole in firewall for this operation.

2. Where is the good location for amplifier?

3. I have changed factory speakers but dash boards has 8 ohm tweters connect to door speakers some where.

My after market radio just support 4 ohm speakers connection. If I live default connection (I think it is parallel connect) both 4 ohm speakers will be total 2 ohm so I need to connect them to another way.

Where connect dash tweeters to door speakers?

Thank you for replays.