I think the general consesus seems to be the Sport Package is def worth it unless you plan on replacing most of the stuff down the line. I personally love the Sport Rays and I don't plan on doing much visually, so the Sport rear/front spoilers are a pleasant add-on.
This topic has been beaten to death so I'm surpised your searching didn't turn up much.
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F.I. / K&N / 180 / Forgestar 
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