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a 4-2-1 will give you more power at a lower RPM range starting at something like 3.5k rpm
while a 4-1 will give more top end power starting somewhere in the 5k rpm range
and I'm pretty sure thats accurate, seen it in too many places to be a "wives tale"
it's said that the 4-2-1 is better for the daily driver while the 4-1 is best if you want to push out the most power on the drag strip
just something to think about for ya
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