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Headers are the quickest and simplest, a cam is probably the most bang for the buck. The cost is fairly similar if you have them installed: the cam is fairly cheap but the installation is expensive, the headers are expensive but installation is cheap or an easy do-it-yourself.
Both will require a tune in order to get all the power gains available, might as well factor that in.
A cam will probably void your warranty on pretty much anything engine-related, headers probably won't. Of course this varys depending on the problem, the dealer, your middle name and the phase of the moon.
Opinions are divided on the gain (if any) from the various intakes. The general consensus is that exhaust mods (other than headers and cats) provide little if any gains.
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
if the question is most bang for the buck. But if the question really is as stated ("quickest and least expensive") then the answer is premium gas. Only costs a few dollars and takes no longer than a regular fill-up. You MIGHT even be able to tell the difference in performance. That's more than you can say for many of the performance upgrades sold.
if the question is most bang for the buck. But if the question really is as stated ("quickest and least expensive") then the answer is premium gas. Only costs a few dollars and takes no longer than a regular fill-up. You MIGHT even be able to tell the difference in performance. That's more than you can say for many of the performance upgrades sold.