meth injection is great, air to air is better in my opinion. if you want your car to have more hp then tune it to race gas with an intercooler that's always there. a few of my friends have owned gn's and syclones if you guys are familiar with them. if not a gn is a buick 3.8 turbo in the 80's. the syclone is an awd truck that's turboed with a 4.3 v6. well my buddy with the gn dumped his meth, ran 110, got it tuned to that, and went from 11.9 to an 11.3 with no other mods. the meth/water injection does cool the flame, and i think someone above even said that it slows the flame. they are right, it does slow it down! but if you are really wanting to make hp then you don't want to slow the flame down, you want to go as fast as it can for your setup. when you slow it you lose hp. if that makes any sense. good luck..... 
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92 LS-L been sitting for 6 years.
86 fiero gt, t-tops, 3800sc, headers, intercooler, p&p blower and lower intake, 3.0 pulley, 1.6RR's, double roller timing chain, xp cam, 130lb valve springs and hooisers :P
87 starion- currently rides on jackstands.
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