Sub Frame too low for large side exhaust

I used 1/2" bigger material to sub frame my Challenger. I need to exit the exhaust to the side. Cannot exit rear due to Jaguar rear end will not let anything larger than 1 5/8" through it. Have full length headers ,want to use X pipe to a single muffler transversely mounted with side exits. I have heard of flattened exhaust being used in Nascar.
I would like to know who might handle that product. I believe it will allow side exit without looking like a sewer pipe.
Anybody have better ideas ...

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Author: 70 Chicanery