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Originally Posted by Shark Tek
Wait a minute, you would not pass emissions tests with a Race Header unless that you add a CAT after the header. The defouler trick is only to cheat the ECU making it believe that everything is fine and emissions are in an acceptable level. But it will not cheat the emissions test machine. 
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are you positive, not to down you but i want a race header and i need to pass emissions. does anyone else know if this is a true fact?
and is there a hole already drilled into the header so the defouler just screws into place??