High flow cats have a coarser mesh substrate that results in higher exhaust gas flow. Another result of this is that it does a poorer job of converting pollutant's into other gases, a lower percentage. Since they convert less, they generate less heat. They're just a way of keeping a check...
Congratulations on your purchase.
A couple things I'd do immediately are check to see if you have the infamous "birdcage" retaining clip on the clutch linkage and eliminate the trans skip shift.
I've had a vehicle in the past (not a Viper) that had a sticking oil pressure relief valve. It would occasionally peg the pressure a gauge and blow out the oil filter gasket. You might want to keep an eye on that gauge for a while.
Energy Suspension 3.2124
https://www.summitracing.com/parts/ens-3-2124g?seid=srese1&gclid=Cj0KCQjwqs6lBhCxARIsAG8YcDiS9rJrlaiI7AyC4WsW31tL6NOPSs__IZZETWyjFAasm0d5i-fV42MaApTJEALw_wcB
https://www.energysuspensionparts.com/energy-suspension-universal-polyurethane-bushings.asp
Yes, I have them in my 2003 rear, I'm planning on putting them in the front as well.
Also, I used polyurethane bushing made for late 80s Chevy truck leaf springs as rear lower shock bushings. These required some washers one both sides to keep it centered. My bushings where shot, metal on metal.
If you only have one cat (per side) and both O2's are upstream of it, removing that cat won't change your engine controllers' ability to detect a missing or non-functioning cat and throw a code. It will be the same as it is now. Tune wise, it could have a slight affect at WOT because of a less...
Just thought I'd mention that the rear access hole, through the belly pan, used for jacking is not there on earlier Vipers. Not present on my '03, don't know when they added it. I've thought about cutting one in mine.
From the service manual:
When vehicle speed is less than 3 mph, the PCM
provides a ground for the solenoid (energized) and
allows shifting. When vehicle speed is greater than 3
mph, the solenoid is deactivated and prevents the
transmission from being shifted into reverse.
I installed Energy Suspension poly bushings 5.3125G without removing the control arms in my Gen3. I just used the old school "through bolt" method with some spacers to pull them out.
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