Water/meth injection
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there are lots of different kits avalible, everything from cheap manual operated, to computer controled mulit stage setups, all depends on what you want to do with it, ebay has them, snow performance has a lot of good options, water/meth will do a lot of different things depending on how you mix it, more water = cooler egt's, more meth = more power, but the meth will raise cylinder pressures, so if you pushing up towards 45psi and over, there good chance you could pop the head gasket, a 50/50 mix is the normal, and cools as well as a boost in HP