I was actually thinking of that and run both machines exhaust into one car muffler…
The pipes are fairly easy to come by.
But only if it’s straight pipes, right? If I run them into a muffler it should be quieter, no?
I’m old and deaf so noise isn’t an issue. I guess I played Boston and Molly Hatchet a little to loud in my younger years. Wait, I still do.
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Yes that should! Be careful parking in grass and running a machine that way. ONLY YOU CAN PREVENT FORREST FIRES!
You mean like the Spokane Police Dept.? Haha. For sure.
(skip to 4:19 for the fun stuff)
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Are you worried for people around you? Or for you? I have Ryobi ear plug headphones that work awesome.
I can deal with the noise myself but I would love to have ultra quiet machines just for the sake of limiting noise pollution in the neighborhood when working all day.
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Understood. The only real option in my opinion is a massive loud speaker playing classical music that drowns it out. 
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I wouldn’t worry about any kind of back pressure using a car muffler. If the muffler can handle the exhaust requirements on a 200 hp 4 cylinder car it can handle the exhaust a small engine puts out.
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I’m with @SchertzServicesLLC I think it may make it louder running it under the trailer. I have an old Bronco and when I installed a new motor and exhaust it was too quiet for my liking. I wanted it louder (I’m a hot rod guy). My tail pipes exited out each side just behind the rear tires. So I cut my tail pipe off just behind the muffler and put a turn down on it pointed straight down to the pavement to increase the noise and make it louder. And this was actually on the suggestion from a Flowmaster exhaust rep! It causes the exhaust noise to bounce up off the pavement and the truck and in turn makes it louder. Just FYI.
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Wanna hear some irony?
We were working a large field fire 3 years ago and truck 1 was parked in picked corn. We all noticed it smoking and it had done just that! We started a field fire while trying to extinguish a field fire… needless to say we put it out instantly and nothing came of it but an ironic story.
My lightning exhaust dumps just before the rearend. It doesn’t seem all that loud but it rattles glass and you literally feel it running from a good distance away. My dodge however has dual exhaust exiting out the back under the bumper and is significantly louder when your in the truck. Makes no sense.
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I put flowmaster 40’s on mine and was very disappointed with the sound I got right after I did the motor swap. I found a flowmaster rep at a show and told him I was having some issues with my 40s and his first words were “they are too loud aren’t they” which I responded heck no! He didn’t believe me and went to the parking lot to hear my truck run and was blown away at how quiet they were. His suggestion was to put the turn downs on and it worked. None of it makes much sense to me! Haha
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I previously was a fabricator and built custom exhaust at a high performance auto shop. You can quiet exhaust a few ways.
The direction of the sound is a big one. Look st semi truck stacks. They point up to the sky for a reason. They also have caps on them so rain doesnt get in. You dont need caps. You can just drill an 1/8 hole at the lowest point closest to the stack and what little water gets in will drain out.
The more curves in your pipes the quieter it gets as it exits. The first generation Z28 Camaro had what they called chambered exhaust. The pipes were actually dimpled on the curves to lower the sound and it had no real mufflers to speak of. It could breathe well and not sound like it just had pipes. I doubt you’ll find anyone who can make chambered exhaust in that size even if you did find an old timer with the old bending equipment.
Exhaust also has resonators before the muffler for the same reason.
Depending on how your equipment is set up you can have a muffler shop bend some 1.5" pipe into an exhaust run that curves a few times at full 90 degree turns and ends up pointing to the sky high up. You can put a resonator in the middle and a quiet motorcycle muffler. Find one from a cruising bike that you can take the tip off and pack with muffler packing. You arent going to close it off but instead roll it up in slide the long piece in. The center will be hollow and it will look like an almost empty paper towel roll.
As far as both exhaust into one muffler you shouldn’t do it. When you start the first the exhaust will run back towards the other machine and make it hard if not impossible to start. You dont want exhaust running backwards into an engine.
It will cost you a few bucks but it’s a solution. You’ll be the only guy with a pressure washer with a stack exhaust in town!
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I got a pipe of slightly larger diameter so it sleeved over my gx630 exhaust pipe. I put a 90deg bend so now it points straight up and cut a slot at bottom of 90 bend so any water ingress can drain out.
Heaps quieter and no worries about exhaust blowing onto equipment or on me .
Not the same as the 390 but a simple fix that works.
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I wish mine were louder. Get neighbors attention when I crank it up.
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Just remove muffler and add hot dog lol
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What year lightning Rusty???
She’s a 1994
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I got one too!!
1994 #624 Crimpson Red
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