Muffler placement
You will know when you have to replace your muffler because you will hear the noise of the escaping gasses just like on your automobile.In my case, on my 1979 30' Hunter, I have just pulled out the muffler due to leaks. The 1 1/2" id hose runs from the starboard side of the Yamar diesel to the muffler which was aft of the engine, just behind the stuffing box, and then continued to the sterm. My muffler was 12 1/2" long and made out of metal. I am replacing with 1 5/8" vetus fiberglass muffler plus all new hose. Total price came in at $200.00 +/-. If you wish to check out muffler's on-line go to http://www.vetus.com or BoatUS, West Marine's web sites.Good luckIan