No telling what they have put on there. Unless they really know what they are doing, this is a redneck hotrod job. As said, unless they selected a proper sized turbo with a compressor that had a proper map to work with the requirements of the Mercedes engine, and correctly modified the injection to provide more power, this is useless. A huge turbo suitable for a big Cummins engine is oversized and will lag, probably never coming up to speed enough to provide full normal boots. As compared to the factory unit. The equivalent of putting a huge Holley four barrel carb on a Honda 4cyl, thinking it will give more power.