I rode shotgun in the '98 or '99 Silver State Classic in Nevada, after supplying a DEAD-STOCK and emission-certified '99 Viper GTS Coupe with only a cage and Halon fire system as required safety modifications; averaged 171mph on the way up, and 177mph on the way back. Anyone can go like Hell in an all-out tube-frame race car - try it in an emission-legal unmodified production car.
One of our ZR1 forum guys (I'm talking 1990-95 model ZR1s) won the open class at the Silver States and or POny Express open road race a few times, including having a tire blow out wreck at nearly 200 mph. He averaged nearly 200 mph if I remember correctly in his wins. *Almost* stock, but obviously some engine and gearing modifications, including having a harness bar (with camera) in most of those races..
If I can find it, I've a photo of the car after the high speed tire blowout...