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Hey TexAndy, The only means I have of recording is my cell phone camera. I tried and in-cab recordings are garbled racket. I have a whistler, too. Trust me, the whistle's still there. :beer: Just not as shrill.

Which Walker do you have? The 21470? If so, that's a nice RV muffler. Just a LOT bigger than I cared to try and make fit.

Hi G., I already did the research on the flow-through (bullet) glass packs. They're rated at 2-4 db reduction, per Walker/Dynomax. The Donaldson is rated at 10-15. It passed that test with my idle for sure (almost 11). The Dynomax bullets are around $60 ($46 and $10-12 "handling" at Summit...

Trust me, I've thought a LOT about running the exhaust out the back. And I'll re-use the Donaldson muffler. I have the whole thing planned in my mind, including exiting behind the passenger rear tire just like modern trucks. ;) The only thing holding me back is time and a long list of other...

NO problem on the measurements. I was as curious as everyone else. The body of the muffler is 7"x14", 3.5" ID inlet and outlet. I attached a little drawing of how it's constructed internally. Noise reduction is accomplished by flow re-direction. When you say "left out lower bent tube", do...

Interesting! You took your readings in different places than I did, that's where the difference comes in, I imagine. My idle was VERY near the outlet of the stack. The 1950/50MPH was in the middle of the cab with me holding it in my hand. My db meter is from work. Used by the Safety Dept. to...

Thanks for the compliment. I'm glad to return the favor to all those who help me on a daily basis here on SS! I REALLY wanted to get some sort of audio files together. But my camera phone produced terrible audio near that stack and the in-cab was a garbled mess with all that driveline noise...

Actually no. But the previous owner bent them from stock (due to tagging a tree or something?) in the past. That being said, you may have to bend yours. The tubes do bend pretty easily so no worries there.

Hello all, I installed the Donaldson M070028 muffler following chgofiveo's thread. EASY install! I haven't reinstalled the shield yet. See pics. The Donaldson is a far superior muffler, in my opinion, due to it's robust construction (Heavy Duty!) and lack of packing inside (packing WILL soot...