Adding on 2 circuits

Just trolling for information and ideas on incorporating two electrical items into my car ie: stereo ( amp etc ) / electric fans ? Already have a plan just want to see what other thoughts are out there .

I'm a believer that any additional accessory electrical load is best kept under the hood, in other words not passed through any factory connectors at the firewall.

I like to use a distribution lug or the starter relay stud and wire in any additional circuits using the correct gauge high-quality wire, Bosch relays, appropriate fuses and quality switches. I follow the Madd method basically.

I've been using Marine grade stuff the past few times I've done this type of work and find the quality much higher than what is usually available from the local parts houses.