Bonus Video: Guntherwerks 400R – Just the Engine

In this video, Matt drives the Guntherwerks 400R down his favorite canyon road. The review is coming soon, but for now, just listen and watch to a 431 HP air-cooled 4.0L engine spinning 7,800 RPM, and pushing around a carbon, wide-body 993 weighing 2,660 LBS.
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