MES
Enthusiast
A Corsa (cat back) exhaust really doesn't do anything for power It's just for sound. Headers are needed to significantly improve the power with the cat back. Average drivers will hit low 12's in the 1/4 there are some exceptional drivers that can hit high 11's bone stock. Even with headers and exhaust there is not much improvement in 1/4 mile times (maybe .2 or .3 sec) You should look at rwhp instead of 1/4 times. Your car and Viper's are close to the same weight (within 100 lbs) so it would come down to the driver and the rwhp of the two cars. A black GTS was only available in 2000 (I believe) so if you want to see rwhp dyno numbers click on my website below then go to "Dyno Results" at the top of the page. I list about 75 Vipers with year, mods, and rwhp.