Depends on the track prep. In TX, I could get away with 17" due to axle breaking prep. In NV, I need the 15" 'cause they prep like crap.
It also depends on your power adder. I have a PD blower, instant torque. I blow off the tires in Vegas at the hit. A friend has a Procharger and has no trouble as torque builds later.
I guess what I am saying is there are a lot of variables.
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