I realy dont think you could put a intercooler an a 617
turbo because if you look at its design and the size of the turbo have you looked at the 1998 1999 300d turbo the intake
and exhaust ports are on opposed sides of the head and the
turbo is a very small turbo to spin up fast compared to the
617 with every thing happin on one side of the head i do belive it would be more problems than its worth just injoy
your 617 in the winter
Clark