Haven't there been at least a few independent comparisons? I remember one on the NICO webpage and a couple more elsewhere. It strikes me as odd that things like this are still somewhat ambiguous. There is almost a Sasquatch mystique to figuring out what, if any, horsepower gains various mods provide. Not a criticism, just an observation.
As I've said elsewhere, my MAZOC sticker has been repeatedly documented as providing +50 hp, and my dual 12" subs add another 27 hp.
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