Dan Prosser and Andrew Frankel ask if performance testing is getting out of hand. With several car makers pursuing 300mph top speeds with road-legal cars, and as showroom models begin to lap the Nürburgring in 6min 30secs, is it time to put a stop to all this or should mankind continue to push the boundaries of what's possible? Dan and Andrew debate those points and more, and consider what role car magazines have played in all this.

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