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lobo - the primary is the diameter of the tubes that touch the motor. the secondary is the narrowest part of the tube that feeds the exhaust pipes.
as to the OBX? well, i ordered a set.....and sent them back. they are absolute shyte. the transitions from the valve exit's oval shape to the primary tube's round shape are atrocious. they just sort of bent a tube & shoved it into another tube. not even centered at the valve outlet. they tried to mill out the metal to make a smoother transition.....they failed.
check it out:
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