IMO grounding to the frame does nothing if your amp isnt ground there also. the reason why it is supposed to is that there is alot less crap for the power to go threw(goop that manufacturers use instead of welds, shity welds, and many different peices of steel). the best thing to do for grounding is to ground right to your batt.

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97 Nissan Pathfinder. D60 ft/rr, locked, doubler, linked, 40's

2004.5 2500hd Duramax. Ext cab, lb, 7" rancho, 35's on 17" XD Hoss, 5" strait pipe, edge with attitude

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