What firewall should use for my power cable?

[VS SLAPPED]

Ok i need to run my power cable for my amp from the battery to the back but i dont know if i should use the driver side but i was told i should. i know were the firewall is but how do i get through any suggestions would help but pics would be even better.

[sweefu]

Is the car auto or manual? If auto, clutch cable grommet is your friend, easily fit 3 runs of 0awg through it.

[VKCOMMO]

SweetFU, what if it is manual?

[MiggzvsC0MM0D0RE]

If it is manual You could try and get under the car and look for a spot. Or You could BE VERY CAREFUL and drill a hole in your firewall in a place that won't cut through anything else.