I have an integra RS and im going to do some major top end work to it in the future. Going to mill the head polish intake and exhaust ports, full valvtrain, reground cams to crower 403/404 spec, ecu upgrade etc. I wanted to know which header i should go for 4-2-1 or 4-1.
I know 4-1 makes greater high end power but for my application i was thinking maybe 4-2-1 is a better idea.
What u guys think?

 

See if this helps.