Hi, I've been thinking the same thing for my 300 SD. I thought about a intercooler off a Saab 9000. I checked with Ebay and used cooler cost about $50. With a cooler and some tubing (aluminized exhaust pipe bent and silicone rubber tubing), I think it'll work. Anything to cool the intake air will help. I bet you the engine will run cooler also because the way it is now, that's a lot of pressurized hot air being blown in.