
Doug Siddens and his RZR during a Pikes Peak practice session – Click above to watch the video after the jump. We all love talking about the Unlimited Class vehicles that take on the Pikes Peak International Hill Climb (for good reason, of course). There are plenty of other classes though, and some of the drivers helming these vehicles are clearly insane. Take Doug Siddens, for example. Siddens is running a customized Polaris RZR, which has been tuned by MCX-USA and now produces around 300 horsepower. The original motor has been swapped out in favor of an Apex 998-cc turbocharged engine that was taken from a Yamaha snowmobile.









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