Uhhh I'm going to have to disagree w/ Kreator here... I don't think OBX is all that interested in flow characteristics of their mufflers; they're just interested in making shiny parts at low cost. That generally goes against 'the flow' of your argument there... ha. ha. (get the pun?) never mind. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt='
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Apex, HKS, Trust and Blitz, on the other hand, take all aspects into account, INCLUDING sound. I am led to believe that they put a substantial amount of money (R&D) into sound tuning their exhaust systems whereas OBX, APC and Arospeed probably don't.