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The mods you listed will do very little to add HP. And GM doesn't have any headers at this time that I know of.
You need to get a quality CAI (cold air intake) like Vararam, CAI, ADM, etc. Then long tube headers with high flow cats. A tune would also be suggested to go with these mods. These mods will give you about 40 hp and make your car noticeably faster.
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