I was going through an old Option 2 from a year ago and they were taking peoples tuned cars and putting them to the dyno, taking out all sorts of un-needed junk from the cars, weighing the junk then throwing them back on the dyno then showing the results. If ya don't mind not having room for passengers then gutting unwanted seats, spare tire, jack, tools, $2k worth of amps and used drink bottles can be the cheapest performance mods a man or woman can do- free! Or in the case of finding a long lost wad of cash under the seats- profitable!