Tornado fuelsaver, Z-max, Timing Booster, Real or Gimmicks ???

So what do you think about the Tornado Fuel Saver, jackson racings ignition kit, Z-max, and also this new timing kit supposedly to increase your hp by 20 pooints, WHICH GIMMICK WORKS AND HOW MUCH DOES IT WORK ?? HP gains and Mileage gains ??

heres the link to the timing kit:
http://cgi.ebay.com/ebaymotors/ws/eB...tem=1855647646