Anyone think the optional cold-air intake worth it? it's basically a neccessary bolt-on for performance standards, i'm not thrilled with the 177-hp so another 8-10hp is slightly acceptable. the price is a little steep but its not a total difference from what i see prices go for cold-air intakes on ebay for solstices. would adding an aftermarket one void warranties? i figure a factory one wouldn't. most people i talked to so far say "go for it". i'm leaning towards getting it, but any advice?