They make vibration motors that you install under the seats that operate much like a noiseless subwoofer. They wire into the sound system and operate off the bass notes. Stupid on their own, but I've heard they add a nice little over-the-edge touch to a system that already had decent subs.Hypothetically speaking, if I had a friend looking for some pants vibration, how would I......I mean him go about doing that......
Personally the last car I put subs in was my 97 supercab ranger, so with pair of 12s right behind me, adding more vibration didn't seem necessary.
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