Side note: Motor Trend put the ZR1 against the Viper GTS. They said the Viper was 2 seconds slower. But the ZR1 had carbon ceramic brakes and the tires are basically street legal race tires. So its not quite a 1:1 test because the viper has steel brakes and Pirelli. Not quite a fair test.
It was as fair as could be I think. Both of them were the fully loaded versions: SRT Viper GTS (the track package)
BASE PRICE-$124,990
PRICE AS TESTED-$141,990
and Chevy Corvette ZR1 3ZR package.
BASE PRICE-$113,595
PRICE AS TESTED-$125,920
The two things you noted were mostly self inflicted wounds by Chrysler.
1) The Viper should have had Carbon Ceramic Brakes as an option. I think any sports/performance car that costs over $100k should have them standard or optional. Car And Driver's comparison of the two said that they noticed brake fade with the SRT Viper.
2) Chrysler (probably more likely Fiat) chose Pirelli tires over Michelins. The SRT Viper is running Pirelli Corsa's , which Ralph Gilles and others who worked on the SRT Viper, feel are as good as the Michelin Pilot Sport Cups. It may be just the corporate line since SRT is owned by Fiat, and Pirelli is an Italian company that has almost always shod Fiat's high performance cars, but he and his marketeers appear to go out of their way to imply that the new Pirelli Corsas are superior to the PSCs they replaced. They also tested the tires back to back during the car's development (I assumed to make sure the Pirelli was superior to the PSC).
Funny thing is the ACR viper that broke the LF-A production record wore MPSC's. The Z06, and the ZR1 also wore the same tires when they went back to the ring and beat their own times after both were beat by the GTR with the stock Goodyear tires. While the Pirelli's have a lesser treadwear rating, the MPSC is generally thought to be perhaps the best cup tire.
I think it's more a matter of accessible performance, driver confidence and that unbelievably good Mag/Rheo suspension.
Maybe Chrysler is saving Ceramic brakes, MSPC, and some type of active suspension for the ACR version coming soon.
It was pretty much "run what you brung" (or have as an option).