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Chop the top of your new Dodge Viper for $35,000

We have good news, and we have bad news. First, the good: It's now possible to get a brand-new Dodge Viper roadster, which is nice, considering we're in the dead of summer and many of us like wind-in-the-hair motoring. Now, the bad: This is not a factory option from the automaker, instead coming courtesy of an aftermarket company called Prefix Performance, and that means it's going to cost you some serious coin.
Called Medusa, this drop-top Viper was created without the knowledge or consent of Dodge, but that's probably fine because Prefix works with the automaker already for the final preparation of the American supercar, including paint. According to the company, the current, fifth-gen Viper was built with a convertible version in mind, so no chassis strengthening is required. From the looks of the somewhat grainy photos available, the conversion appears of very high quality.
Want one? Well, that means you're going to need to procure a Viper - Prefix has 10 units ready for transformation as it stands - and that's going to cost at the very least $102,485. Then, you'll need to write a check for an additional $35,000 for Prefix to surgically remove the car's roof. Thing is, for that kind of cash, a prospective owner could buy, among other very nice options, a Viper hardtop and a loaded Miata, or a Corvette Stingray convertible and several pockets full of change. Or, perhaps a new Viper hardtop and a used, first-gen Viper convertible?

Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"

11 vehicles from Barrett-Jackson Las Vegas worth watching

This weekend will see the world's collector car crowds descend on Las Vegas, NV for one of the biggest shows on Barrett-Jackson's popular auction circuit. There are hundreds of vehicles up for bidding, ranging from a brand-new Lamborghini Aventador to a spattering of Art Deco classics and a huge swath of classic muscle cars.
While it's virtually impossible to assemble an inarguable list of the best cars coming during the three-day, 700-plus vehicle auction, we've sifted through the listings for this year's show - it was a tough assignment, we promise - and assembled a list of what we think will be some of the most interesting lots. We'll admit, it's a bit heavy on American iron, but if you browse BJ's listings, you'll come to a similar conclusion. Still, scroll down for our list of what we think will be the most interesting vehicles at the upcoming auction.