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I think it all depends on the car and the intended purposes. Jack has a 3.6L in the back of an early 911 that is really built for the track, so 21/30 worked for him (although I did caution him about this at the time he was considering it). An '86 Carrera daily driver is an entirely different car - I would not go 21/31 personally. It will likely hop around and exhibit snap oversteer unless all the shocks and sway bars are upgraded to race set-up, and then it isn't a daily driver anymore. Just my .02...
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