Just did this on a customers truck. Not worth the time and hassle. The down pipe had to be cut and rewelded (assuming you already have 4" exhaust) with a v band flange to fit the CR turbo elbow. On the pressure side a CR boot works but is not the best solution, so a tube has to be custom made there as well. It would be easier to use a HX-40, they are about the same size as a 04.5 CR turbo