this question may be stupid or anwsered already but i just was thinking..ok on a smog car..im going to get the headers high flow cat,and cat back system but what would happen if i dont run the mufflers that comes with it?would it sound better worst not pass smog?thanks

 

no mufflers = loud car not good for sound or to drive to much.
passing testing could be hit or miss. as the Cat. dose most of the wrok with the rest of the system.
But it dont mean it it takes care of all of it. and if your tune is off it will fail.