Well if I do buy one it won't be for a while yet as I'm just about to move in to my first home with my pregnant girlfriend, lol. I've been torn as to whether I can keep the civic but we've been discussing selling her car to save some cash. I need my wheels refurbing after this weather gets better too, but I'm not even gonna bother until the salt washes away.
I really like the look of the standard exhaust, but I just wish it sounded a bit more sporty. There are a few CTRs near me that sound much better as they have aftermarket exhausts. I had a full stainless system on my old civic (megan mani, decat, 2.5" catback, 4" backbox) and it sounded immense, too loud for daily driving really! Don't want to go back to that again but I do miss the burble at low revs.
I've been looking on the Blueflame website and they have a dyno graph that suggests that their system gives marginally more power, but then again I wouldn't expect any manufacturer to say otherwise. I wouldn't expect much though as I think the standard system is probably good enough for a standard engine with just air filter mods. I'm not planning to splash out on a K-Pro either as its just too expensive for me to justify right now, so any gains with either system would be negligible. All I'd really be wanting is something that doesn't look out of place, sounds nice (but not too loud) and is well made. Any improvement in power would just be a bonus in all honesty.