Yes the specs are real. The amps are left over surplus from an OEM project. Its a lot of power and was crazy over specced for the OEM.
We have a full plug and play harness for this and the BMW
These have been fitted to a number of BMW's already. Here is a review...
The bit DMI will work in the car with a quick software update coming out this week.
Or you can just go the full integrated MOST amp solution which will save you time and space https://mobridge.us/product/mobridge-most25-amp/
cheers,
mObridge