The battle between America's preeminent supercars continues as Inside Line has taken a stock Dodge Viper ACR to the Bonneville Salt Flats to see what it can do. We'd say it did rather well. On the final run of the day, Dodge's ultimate Viper slithered its way to 173 miles per hour on the 10-mile long strip of salt. There's a great story about what it took to reach that terminal velocity, click here to read it.

By way of comparison – and because we know you're all wondering – Top Gear's Jeremy Clarkson was able to wring a stock Corvette ZR1's neck to about 176 miles per hour at Bonneville in an episode that aired late last year. Different days with different weather conditions to be sure (update: as pointed out in the comments, the ZR1's figure was achieved with just 1 mile of runway), but it's always fun to stir the pot, right?

It's not just in straight-line acceleration where the two American heavyweights duke it out, with the Viper ACR recording a blistering lap of the Nurburgring in just 7:22.1, which compares rather favorably to the ZR1's 7:26. Strapped to the dyno, the Viper ACR puts down a whopping 546 horsepower and 510 lb-ft of torque compared to the supercharged ZR1's 549.9 horsepower and 500 lb-ft. Now, when does round 4 begin?

Hennessey Performance Engineering is claiming to have built the fastest R35 Nissan GT-R in the world - and while it’s April 1, we’re not kidding.

Using its GTR700 upgrade kit (which adds turbos, inter-coolers, blowoff valve and electronic boost controller), Hennessey’s Nissan GT-R produces 725-hp with a maximum torque of 630 lb-ft. That allows for a 0 to 60 mph run in just 2.8 seconds.

The top speed record was set at the March Texas Mile event where the Hennessey tuned GT-R went from 0 to 193.7 mph in 1mile.

The Hennessey GTR700 can be purchased for $18,500 or $24,500 installed.

Oh, and for those who really want to see what a beefed up GT-R can do, just check out the Hennessey package:


http://forums.motortrend.com/70/7485...nis/index.html

Killed the Vette in 1 mile, by almost 18 mph, for the same price!

If Nissan offered this the GTR700 in a "stock" format for the comparably priced $100,000 Vettes and Vipers, we could send it back to the track and see what kind of times it runs. lol 725hp GT-R!!! lol

These times aren't comparable because they were achieved with different drivers, on different days and in different conditions. What we do know is that the ZR1 is significantly faster than a GTR. Trying to make excuses for the GTR "only" being XX seconds slower is neither here nor there.

What exactly are you trying to prove?

Just to "stir the pot".