Damn just recalled a article one time about bass and the O. These guys tested different frequencies to see what Hz would get a girl to O. I think it was around 33Hz or so!

There's also this kick ass Bronco out there somewhere, can't remember the people who built her but wins a bunch of comps in Bass land. Damn! Thing's got 1"
editthick glass or something so it doesn't blow the glass. Crazy crazy a$$ sh!t man!
So a suggestion. If you got that bump in yo trunk and its got some rumble in it! get a test CD at, get it to 33Hz and pull up next to some car filled with hot chicks, crank it, and go with it! hahahah let me know if it works. I have yet to see it in action.
-edit-
Beast, you forgot to post specs on your sound system