Surely someone in the SLK world has proven this thing one way or the other. I bought a Saturn several years ago and the guy who owned it before me had installed am AEM CAI. I've read these things give a proven 9 hp gain even on a lowly 1.9 liter 124 hp motor. Also, a bud of mine with an '05 S2K says the AEM CAI is a proven setup on his car as well. I don't believe they make them for our cars but from looking at it the concept should be easy to copy.