How far is too far? Coil location

Mine is mounted to a panel that sits on the inside of the firewall, directly behind the motor. I use the MSD coil wire. I think it's 18" long. Keeps everything tidy and away from the heat.

Edit: Worth noting that I have a very thick rubber grommet for the firewall hole that is dedicated to the coil wire. Chasing noise issues is not fun.

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