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No better ground than the frame. Bolt to your rear subframe. It's welded to frame connectors which are welded to the front frame rails. If you've got a problem with a ground then you've got worse things to think about. You won't find a ground to the front in a new Charger or Challenger that have the battery in the rear. Trust me, new cars have way more electrical issues to deal with than a simple car like what we both race. In case your wondering, I work in the Electrical lab at Chrysler Tech Center.
Doug

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I know that most of the new cars I work on have several grounds through out the wiring and every so many feet also to help even more w/all of the on board electronics. I`ll run a #10 from the batt to bulkhed which the MSD is also directly grounded to which can`t hurt and I believe the MSD instructions suggest iirc.