I honestly don't see how putting a viper motor in a mustang is copying anyone. Nitmare Motorsports did a TON of super custom stuff with his build (I'm in love with his exhaust setup), and it's a very hardcore, top notch, all-out type car. Just because you're going to put a mild Viper V10 in yours doesn't mean you're ripping anything off. If your car pulls out of your garage for the first time with a road race cage, kirkey's, through the quarter panel side exhaust, 19" 3 piece forged wheels, twin turbos, and a bunch of powder coating under the hood, I'll be the first to step in and say you ripped his build off. I highly doubt that is going to happen though.