The installation of headers is a nightmare from what I read. The benifits of the headers is negligible in my opinion from the results I read.
If you plan on going with a supercharger, Stillen even says not jump on that bandwagon yet as they have found up to a loss if 1 psi boost with headers. Some say that more air may be flowing regardless of the drop of boost but the Z already has headers on it and I can't imaging aftermarket headers being drastically better.
I am not going to go there, same with the pulleys. These mods offer negligble gains that I dont think are worth the install pain or money. The real power is forced induction, free flowing exhaust, and tuning.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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