Doc, There is a simulation mode that allow you to play with it and get familiar with it without hooking it up to a car. It is menu driven, you can tell when you get to developer mode because it turns into German! This system is best for someone doing or has a V8 conversion. I did use it successfully on my car when it still had the V6 in it. I am not sure how if would communicate with an SRT. Some functions could be limited when a computer's part number is not common to a MB. Chrysler didn't use DAS, They used a really crappy system. I posted this on Benzworld since it will do anything to a Mercedes but listed here because some of the guys here have used them and/or want one.