I don't know for sure, but your car will need both HHT and DAS. The Star system will switch between the two as needed and you access various control modules and such. As @i860 mention, your best option is a MB Star system with either the C3 or C4 module. The C4 is a bit better and faster in the data pass-thru, but typically a little more expense.Thank you, that's very helpful and clears up some confusion I had with the different diagnostic systems past and present.
I personally own a post-facelift R170 from 2001 with the OBD port located in the cabin, not the older model with the port under the hood. Is this the differentiator for whether the R170 requires HHT or DAS?