Installed a 7 point grounding kit on my car last night, and the results are very positive.
Car seems to shift smoother, idle better, and throttle response when engaging 1st gear is a night and day difference. I can't tell you what a difference this made for me. I would have paid $100 or more dollars for these results. Instead I only spent $40 worth of 4 gauge battery cables at Autozone...
After the installation I also noticed that my Voltmeter didn't jump nearly as much as before. I'd dip into the 12v area before when I had huge bass, but now it hardly breaks below 14v.
Here's a layout of where I made my "connection points" - all 10mm bolts
1 - Negative Terminal on Battery
2 - Stock Grounding Wire Location on Frame, you'll see the stock wire run to the intake manifold
3 - Metal Wire Harness. Put one lead under the harness and one above.
4 - 10mm Bolt located just right of the headlight.
5 - Grounding Wire location, this 10mm bolt has a metal harness attached to it.
6 - Grounding Wire Location on Intake Manifold - Pretty obvious
7 - Tranny - One unused hole where a 10 mm bolt can be attached. - Isn't pictured but you'll see it.