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the deal is good in relative to price of headers and install. I don't think you're going to see 15hp from headers. There wasn't much details posted regarding the dyno. Usually the only people to get headers are those going full blown N/A bolt-on route and get hi-flow cats or test pipes. Unless you are going down that path, i'd probably not recomend headers because you will most likely need a tun . I'd would probably rather spend that money on a UTEC
You probably could shop around and save some plus the gas in the drive, but that's not too bad of a deal. If you plan on staying N/A, you should get a Utec to help maximize all of your gains.