Not Ranked
We quite regurally dyno cars with hp in the 600, 700 and occasionally 800+ hp and if the car is tied down correctly there will not be a problem--its on Mustang dynoes and they have rollers with the raised knurled type pattern for traction--
Only twice have we had to add any balast to the trunk to counter slippage and it was a 800+ Pontiac convertoble with no back seats and a lite rear half--
Never been a problem with a Cobra at the 5-600 hp range.
Your wasting your time changing tires and wheels
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