I’m sure you’re find a good solution seeing everything first hand. I understand your feeling as I am going to go through similar on my 95 soon. I traded SW long tube for SW short, catted headers and replacing their cats with C6 Z06 cats. I measured and had the bolt on flanges to stock exhaust welded up. I won’t know how it fits and matches up until I get to it. Hopefully my guess and calculations were good. Best wishes and you’re welcome. Sorry could not be of more help.
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ZR-1 Net Registry
__________________
Craig
"ZR-1 NO KA 'OI"
"ZR-1 ICHIBAN"
1995 #228 Black/Black with Dunn Heads
ZR-1 owner since September 2003
ZR-1 Net Registry Founding Member #0074
NCM Lifetime Member #2048