Well considering the 03 has the intercooler built into the lower intake manifold, just by fabbing a sheet metal upper makes it easier instead of spending the money for an intake(if you can find a complete one used) and then the intercooler from a reputable company. So factor in the price of an intercooler and intake...you could have a sheetmetal hat fabbed up for the lower intake. It would also make overall plumbing for the turbo kit easier.