The Cadillac CTS-V was the first production four-door sedan to ever traverse the Nurburgring's North Loop in under 8 minutes - logging a 7 minute 59 second lap - but the Porsche Panamera Turbo one-upped the Caddy with a 7 minutes 56 second lap. However, both cars have now been knocked down a peg, with the M5 setting the new course record.
However, the M5 might not remain at the top for long. The more powerful Panamera Turbo S has yet to go round the "˜Ring and, with 50 horsepower more than the regular Turbo, the S will likely have what it takes to dethrone the new king.
References
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