LS7 Exhaust Flange

To all you guys using LS7 exhaust manifolds. Where did you find the oval flange to mate up with the bottom of the LS7 exhaust manifold? I'm having the exhaust fabbed up and want to make sure I get the flange mated up right with the manifold.

Or do you guys know of a short downpipe for the LS7/ZO6?
 
I used those in SS. Had a bit of an issue with them warping, be careful. Not knocking them, I would use again - just need to manage your heat.

RCR can send you steel ones. I actually have one of the RCR steel sets on the shelf I don't need if someone wants them PM me.

But I'd suggest everyone stick to SS.
 
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