I drove an ISF a couple of times at Skip Barber at Lime Rock. Fun car, good noises, a blast on the infield autocross course where the back end gets wiggly putting power down coming out of corners, but overall not a threat to the M3, which was just so much better in terms of control and response on the main track. (We drove an ISF, M3, 911, Cayman, and Lotus Exige S.)
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