The growth in the installation rate far exceeds earlier estimates of 50% that were set less than two years ago.
The luxury automaker also plans to offer Sirius as standard equipment on two additional models this year the S-Class and CLS. The new models will become available with Sirius at dealerships later this year.
Sirius is currently standard in Mercedes-Benz's SL-Class and CL-Class.
--Karl Greenberg