Whew! I thought this was some kind of f'ed-up personal ad.
(Links' language NSFW - no pics though)
http://www.urbandictionary.com/define.php?term=DP
http://www.urbandictionary.com/define.php?term=sub
Anyway... I have a cheap downpipe, but I don't need any subs... err... subwoofers.