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Hello,
For the street/strip I would say the progressive 4 blade.
Damon
Sorry but single is better. More air flow and quicker response. Tuning is done via a laptop, and should not be done on the mechanical end. Restricting air flow with a restrictive 4-blade, is just that, restrictive...Just let the map go a touch leaner, and without all the timing the motor wants in street tune, it has almost the same effect.
In race tune, let it loose....
And I don't mean real lean, just enough that the engine doesn't climb rpm as quick. Its like not having enough squirter shot in the carburator.
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