Start with http://www.pgmfi.org/ and read, read, read until you have no more questions about tunning. Then get back on here and search for "Tunning XXX" (XXX being whatever method you decide to use) The VAFC or EManage, or any other piggy back unit only tricks the stock ECU into giving your car more fuel. You want complete control over your engine if you plan on going F.I.