You will loose HP with flowmasters. Sure they sound great, but they are chambered. Right now, you can't beat magnaflow exhaust. It's only $350 for stainless steel, flow-thru muffler system with 2.5" madrel bent piping. It's quiet during normal driving, and gets loud when you get on the gas. It's the only one that dyno proven 13RWHP too.
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Exaust... MAC PRO-CHAMBER proves a 22.2 RWHP gain compared to stock on a 2V 4.6 and a 4V was around 25RWHP.
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Maybe if you drive a civic. Gains that high only come with an offroad X or H pipe, and catback system.