I just made one of these for a good friend and since I have the necessary parts out, I figured I'd make a feeler post to see if anyone here wants one. Just going to make a few more and this offer won't be good for very long because I have other stuff to do.

Plugs into the expansion port in the back of the system, I use thin enough wires that it IS possible to put the dust cover back into place. Comes with printed instructions to tap into the appropriate points.

$15 plus shipping. (prefer sending USPS priority with electronic DC, $4.60) Cheaper than a Turbo Booster or sending your system out to get modded.