lets assume your blower has a 50mm connection for the charge pipe
your intercooler has 2.5"
and throttle body is 67mm

any recommendations on what size piping to run, and where to step sizes?
aiming for a 10psi setup, yielding 400hp. loosing minimal pressure is important.

 

since you have a 2" outlet on your turbo you could just run 2" piping to the Intercooler and step it up there and run 2.5" to the TB, how I use to have my old setup done.

 

i have 2" piping from my compressor to the ic and then 2.5" piping from the intercooler to the tb. Making 360whp on 16 psi from a 57 trim. I think the 2" section of piping along with a fairly small ic was starting to choke me up a bit.

 

running a lower psi (10) should prevent me from experiencing that choke, right?

 

67mm tb, is that a 3" coupler?