Since it's the same on both banks, it's unlikely to be a plug, wire or injector. Clogged air filters, restricted exhaust (CATs) or MAP sensor could make it go rich and be the culprit.
This is the standard test every shop uses to check CATs, normal should be ~200F before, ~400F after, checked with an IR thermometer. Much easier on a non-Viper with everything exposed.
A 160 thermostat starts to open at 160 and will be fully open by 170. A 180 thermostat will be fully open by 190. So, at 200, both thermostats are fully open and do not provide any restriction, they are the same. At this point the cooling is determined by the rest of the system.
A couple of things.
If you unplug a plug wire at the plug, you should get CEL almost immediately.
If there is a plug that is not firing (shorted, fouled etc) the upstream O2 sensor will detect the excess unburned oxygen from that cylinder, the engine controller will interpret this as...
The "rotten egg" smell is the classic complaint with catalytic converters. Been that way since the 70s, always hated it. It's normal, whenever I witness a Toyota (or anything else) go wide open in front of me, I get a whiff.
But, your metal exhaust tips or pipe is actually expanding?
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.
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