i agree...ground should be no more than eighteen inches long, a solid chassis ground. to start, i drill like an 1/8" pilot hole and use a short fat course threaded bolt, like a license plate would have, i would scuff a nickel sized area down to bare steel around the hole, and i use dielectric grease to make sure that corrosion doesnt build between the chassis and the connector. ive said it before and ill say it again-grounding is crucial to any electrical system in your car. i also agree with matching the pos and neg cable, like your engine, you could have your ride inhaling through a six inch intake tube, but if you keep the inch an a quarter exhaust it wont do a whole lotta good...