In {TAIL ~ one form} of the invention the exhaust pipe forms {HEAD ~ a part} of the heat exchanger reservoir in which case leak preventive adhesive secures the heat exchanger member to the pipe 
In { TAIL ~ one form } of the invention the exhaust pipe forms { HEAD ~ a part } of the heat exchanger reservoir in which case leak preventive adhesive secures the heat exchanger member to the pipe
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH