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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.
Headers just might void huge aspects of your warranty (as doing a tune would). I'd ask your dealership and get it in writing if they say headers are OK. My experience is that the dealership will aggressively deny warranty repairs on anything even remotely related to a modification. About the only thing you might be safe with is an after market cat-back exhaust (not considering that as a performance mod per se).
I can't blame GM either....they engineer, build and warrant their product. If someone subsequently alters the performance attributes of the car....why should GM pay to repair anything related to such a modification.
Also, did you misspell blond on purpose as to indicate something about blonds.
The spelling blonde is still widely used for the noun that specifies a woman or girl with fair hair: The blonde with the baby in her arms is my anthropology professor. Some people object to this as an unnecessary distinction, preferring blond for all persons: My sister is thinking of becoming a blond for a while. As an adjective, the word is more usually spelled blond in reference to either sex (an energetic blond girl; two blond sons), although the form blonde is occasionally still used of a female: the blonde model and her escort. The spelling blond is almost always used for the adjective describing hair, complexion, etc.: His daughter has blond hair and hazel eyes.
Dictionary.com
The spelling blonde is still widely used for the noun that specifies a woman or girl with fair hair: The blonde with the baby in her arms is my anthropology professor. Some people object to this as an unnecessary distinction, preferring blond for all persons: My sister is thinking of becoming a blond for a while. As an adjective, the word is more usually spelled blond in reference to either sex (an energetic blond girl; two blond sons), although the form blonde is occasionally still used of a female: the blonde model and her escort. The spelling blond is almost always used for the adjective describing hair, complexion, etc.: His daughter has blond hair and hazel eyes.
Dictionary.com