.........................snip......................
I remember some (not crazy) muffler warranty! (because it was assigned to me!) Design guidelines always warn about mounting mufflers and intake canisters directly to engines... especially diesels! But in small packages (compacts on down) you have to. I recalled some failed warranty parts and saw the muffler failures: cracks at the header-to-can joint. I had Test order in some snazzy high temp stain gages and gaged up a new muffler. Installed on the several 430's we owned in Engineering... quiet. Low strain, no issues. WTH? A guy in Experimental told me though, his personal 430 had already cracked several. So with his backing, I had his machine picked up and brought to JD, gaged muffler installed, and tested. You guessed it... that stupid thing lit up like a search light! I had the engine guys go over it too... nothing wrong! Turns out, some desiels have a certain shake that others don't. I reinforced the muffler design as much as possible but a small percentage of machines could still fatigue one within their life.