Ok so first is:
Nology Hot Wires, apparently they allow for a greater transfer of spark for superior combustion.. And I must say, this is impressive.

So if you get a stronger spark you'll get way better combustion, and more power, cool idea and I've seen it on so many cars now that it's gotta work.
and
http://www.gfchips.com/Tuning chips, $70!
Regularly these are $400 msrp, this site sells them for $70, they claim that you get up to 60 hp when you use it, I'd say on a 4 cyl, turbo car like mine it would get around 25-35 with this chip, $70 doesn't seem so bad for that much power.
and
http://www.royalpurple.com/wp-content/uploads/SportTruck_10HP_Oil_Change.pdfThese guys got 10hp out of only changing their oil, that's impressive, I'm looking into the cost of this in the morning.