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http://www.edmunds.com/insideline/do/GeneralFuture/articleId=120921When the unimpressive Acura Sports Car Concept debuted at the Detroit auto show in January, most thought it was a glimpse at the next-generation Acura NSX. Since then, Honda has been silent about its upcoming V10 supercar. Not anymore.Wearing heavily modified S2000 sheet metal and riding on a platform with an extended wheelbase and wider track, the front-engine V10 test mule broke cover on Germany's famed Nürburgring test track. And like the upcoming GT-R supercar from Nissan, this Honda prototype was paced around the track by a Porsche 911 Turbo, proof that Honda means business.