You did NOT say the year-model-wheel size. IT MATTERS !!!!
I'm not a fan of Drag Radials on the street IF-IF-IF you corner aggressively.
There have been anecdotes here of "SCARY" cornering, especially exit ramps, on-ramps etc if you try to take it "NORMALLY" fast for a Viper. BE CAREFUL!
Why? THE SIDEWALLS ARE INTENDED TO GIVE / FLEX MORE ON A DRAG RADIAL. SQUIRRELY CORNERING can be a formula for disaster if you over-corner the tire. If you love fast cornering, and choose this option, RELIGIOUSLY monitor your pressures and boost them for road use. P.S. They have almost NO road-hazard protection. A bad pothole can break a belt.
I would suggest Michelin Pilot Sport CUP tires, 345-30-18. As sticky as a Kumho, and intended for safe high speed and cornering. Wider contact patch than Kumho. If you have 17" wheels, go w/ Kumhos.
PPS. You are looking for rear tires....your fronts are alos 7 years OLD?
New sticky rubber rear, and hockey-puck-hard fronts are a great way to test your airbags (if so equipped)or your sternum if not.