Does anyone have a good recommendation as to where I should attach my amplifier ground wire in the trunk? Or should I just drill a hole anywhere on the metal and attach it?

Thanks.

 

The rear seat bolt is agood amp ground.. I have my amp hooked upat that location..

It should be a more solid ground location than a drilled hole since you can apply more torque to it and not have to worry about stripping it. Since you can make it tighter, there should be less chance of it vibrating lose.