Installed a part on your Civic and want to give your opinion? Please do here!
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By Treezy
#155839 I'm running a D15 @ 10psi, aftermarket header (ebay special), and a Tsudo test pipe through the OBX-R HP3 "Harpoon Series" muffler.

I'm not a fan of OBX (as you can see in my other posting for their fuel rail), but this muffler is actually a good thing. I'm running 2.5" piping off the test pipe and it sounds great. It gives a nice throaty sound without too much excess ricer noise. Not to mention that it shows really well on the car.

Will I keep it? No, but not because it's a bad product. If you run across one of these cheap, I'd recommend it for most applications. OBX-R.com is selling it for $139.