I think you'd be best with 18". I can hear the exhaust just fine. Before it was broken in and quitted down, I had to turn the stereo up to hear it. (I imagine that that how a 12" would have sounded like post break in.) But know I can listen a the same volume and still hear the exhaust even at low RPMs. With stock I did not hear the exhaust (with stereo on) until above 5000 rpm.
Mind you I listen to sports radio mostly at conversation volume level.
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Member of kenchan's "photoshopped mods" and "proper offsets" gang.
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