So I decided to rip apart my bumper and insert my grille. Then I decided to do my header. The flange that connects the manifold to the cat has a 12mm nut on one side and a 14mm bolt on the other with springs, I imagine it's to torque it down enough to push the header/mani all the way in. But what I don't understand is WHICH side I should be loosening from? If I do the 12 mm the 14 spins with it, and same with the 14 mm. Should I loosen the nut? Pics; Header into flange with the 12 mm nuts; From under them; 12 mm nut is on the left side; ..... As she's sittin now; See, I'm not afraid to work on it. Just didn't have a place until now.