Yeah them couplers should work fine.Get some clamps and you nee something for the nipples.
3" OD 45 deg Elbow Alum Intercooler Intake pipe Turbo - eBay (item 330492961995 end time Mar-04-11 19:55:43 PST)
3" OD 45 deg Elbow Alum Intercooler Intake pipe Turbo - eBay (item 330492961995 end time Mar-04-11 19:55:43 PST)