i was trying to do some research. . .
and i have a few questions. .

what's the difference between 4-1 and a 4-2-1 ?
is a 4-1 better in top end, while 4-2-1 is better in midrange ?

what would be a better choice for a gsr (my motor), and what companies?

i have a greddy 4-2-1 coming in tomorrow, and i think i should have done more research before i made the purchase, because a bunch of people are telling me different things about them, and everything's confusing me

help would be appreciated