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 When I first put the 2 chambers on my car, it sounded loud to me at first because I had stock exhaust before them.  But after a few days, I realized they just weren't loud enough.  So I put a 2 cat H-pipe on and then it was pretty loud, but a few days later it still wasn't loud enough for me.  So then, I got a used off-road H-pipe and threw it on....  THEN IT WAS LOUD.  After that I put in BBK equal length headers and it was not really louder...  But more deeper and agressive.  I think my car sounds awesome...
 In other words, if you really want the sound of a mustang...  Go with the 2 chambers..  Because most stangs that you hear driving on the street have the 2 chambers.  And they sound sick.  Atleast in Massachusetts anyway...
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