i recently learned a little tip from my turbodoge forum for cheap intercooler piping

 

seems alot of those guys run the wire reinforced diesel radiator hose <like 18 wheeler type diesel>

 

much cheaper than silicone stuff

Yep, fuel tank hose works really good too 2"-3" is common and it's rated for fuel/oil, if it's too stiff u can heat it up with a torche and size it just right. Any old ford or chev truck will have good lengths and som 'utes too. I've used rad hose before just make sure you keep the springs cause a bunch of heat and then heavy vac[like after a hard downshift] will cause the hose to collapse.