Agree with GTS Dean. No cats should mean that you shouldn't need anything extra done to keep the temps down.
Good read here - Dodge Viper GTS Exhaust Heat HeatShield Products
It's debatable on the effects of the wrap but I thought it was a pretty good article.
For side sill vents, these look nice. - https://www.speedtactics.com/various...qr-cdxnm-h8fpb
These are also debatable on effectiveness and also some concerns around debris being allowed to enter the openings and causing potential challenges.
Dave666 will most likely chime in with his mods which seem to work real well. I'm to chicken *&^% to try it though.
98 Red GTS - Corsa exhaust, Belanger Hi Flow Cats, Smooth tubes, K&N filters, Custom Stereo, Forgestar F14 wheels, BC Racing Coilovers, HOWE radiator, Tuned by Dan Lesser from Viper Specialty Performance.