Well. I can tell you this much:
a. Two jet sizes can make a difference in the quarter mile.
b. Two jet sizes can produce a noticible difference on a dyno, or, make a very small difference depending...and when its that close, go toward the richer pair.
c. Two jet sizes on the primary side can make a HUGE difference crusing at interstate speeds. Like the difference between drivable and not drivable.
-- You probably can take a pretty good guess at how I learned these things.
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