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[Greasygreg]

depending on what kit your looking at, a cat back system can also increase your exaust pipe diameter.most of the stuff humanoid told you follows true for this rule too,if you can get your engine to breathe better, it can make more h.p..ie the intake mods-air filter (thats breathe in) the exaust(breathe out).underdrive pulleys are a good theory,as would be losing the stock fan and switching to electric.its all about how much h.p. you want to make v.s how much you want to spend.p.s have you really only put 15k on your yota in 5 years?if so your horse needs a new saddle