Ok so if I take what you're saying how I'm understanding it, flip the flange end for end (not in a left to right manner but up and down), that's exactly the same as flipping it backward and running it as I have now (not pictured). The flap would have to rotate with the flange due the the machined lips specifically made for the different sides of the flapper so that it seals. Does that make sense? I flipped it last night so the motor is pointing out the left side now but is indeed installed backward. I have a feeling I'll be redoing that whole section of the exhaust on both sides at some point. I thought that the flanges were somewhat close to even with the bottom of the headers, but the cutouts are at the center of the car which technically would be more of an issue like when loading onto a trailer or something. It's hard to tell when it's up on jack stands at both ends. I'll play things by ear for now (no pun intended). Today is engine start and break-in day so that's priority 1 at the moment.
