Exhaust brake for gasoline engines
I found this while browsing thru an RV forum. Unfortunately, this vendor has stopped using a web site but can still be reached by mail. There were two postings for owners that have actually had the device installed on their rigs. One had put over 150,000 miles on it with no ill effects and loved the performance. Just stated that the simple maintainance program had to be done regularly.
Where I live, there isn't a big need for this. But I thought it may be useful for you folks that do a bit more mountain driving and drive gas powered busses.
Here is the info:
Louis King, Owner
4837 E. Indian School Rd.
Phoenix, AZ 85018