Ive installed my battery in the boot and I need to run the power cables from it. Ive heard somewhere that you need 9.8mm od at 170A. I have LOADS of cable from previous amp wiring kits and they are all 8mm, is this going to suffice? is there a higher load on main live cables as opposed to amp power cable? Only asking as I am skint and cant afford £4 a metre of the stuff!! Ben