Whats a good spot to ground my amp in the trunk?

 

The bolts for the bumper mount, lift the carpet and you'll see them. If that doesn't work for you, just create your own ground.

 

self tappers anywhere (except over the gas tank)

 

basically anywhere on the chassis is good. don't use the seatbelt bolts though, since they don't really have a good connection. like subs said, you can just get a self tapping screw and ground it. but at the grounding point, sand off any paint first. this will allow better metal to metal contact, and reduce the chance of getting alternator whine.

 

just for temp i ran mine to the trunk latch.

 

Use contact grease. Dont allow rust/oxidation creep between cont acts...