Long story short..top mount ex. mani...3 inch v band outlet on compressor...3 inch inlet/outlet on intercooler...4 inch/90mm TB that is currently a slip on hose clamp.

What sizes should I go with?? I was thinking trying to adapt to 4 inch on the outlet of the intercooler and take that all the way to the TB. So 3 inch from turbo to i.c. then 4 inch from outlet of ic to tb.

Will a step like that mess up the system??

Thanks!

 

just get an aluminum transition and weld it so your piping goes from 3" to 4" somewhere inbetween the throttle body and intercooler.

 

agreed