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Hooker maxflow was the best flowing quietest performance muffler in the last big magazine test I saw.
Why not set it up with an electric (or boost activated) cutout and factory type muffler? I use a 4" downpipe and 4" cutout, Then have a dinky 2" pipe "T"'d into it. That alone quiets my 6.0 liter down a TON. can easily talk in the car and thats with no muffler.
This is my whole exhaust system. Flows enough to run 8 sec 1/4 miles and is quiet enough to talk on the phone with the dump closed.
Ok now you got me thinking. Is that really your whole exhaust? No muffler or anything? I know the turbo helps with the noise but cutting the pipe diameter in half like that makes that big of a difference? If so, maybe you are on to a good option for me. 2" main pipe with a boost activated cutout. I might even have room to do that. How is the power difference when you have the cutout closed?
Doesn't look like there's much space to grow there, but you need to figure out what the absolute biggest muffler you can fit is. The larger the can, the quieter it'll be.
There's some good info, including a variety of practical examples, in this thread over on corner-carvers.com. The Dynomax VT, which a couple of folks have mentioned here, seems to get good reviews there, too.
If it's drone 1/4wave helmholtz pipes are AWESOME but if it's truly just exhaust loudness it's not quite as effective. 3.6liter twin turbo car (flat 6) quiet enough to talk in but loud as hell outside. No mufflers, just Helmholtz pipes and the turbos...
I could probably fit an oval if i did it offset to the same sides. But do you really thing just switching to an oval would quiet it down? I cant see it making a night and day difference like i need.
yes, oval muffs have more packing inside thus quieter. i think the offset helps quite a bit as well.
Ok now you got me thinking. Is that really your whole exhaust? No muffler or anything? I know the turbo helps with the noise but cutting the pipe diameter in half like that makes that big of a difference? If so, maybe you are on to a good option for me. 2" main pipe with a boost activated cutout. I might even have room to do that. How is the power difference when you have the cutout closed?
Yes, that's the entire system. Here's a sound clip. I later added a small 2" cherrybomb muffler to it. It didn't make as much difference as I hoped. I'm planning to cut it back off to save the weight. This is an 8 second drag car... 1000ish hp. Sounds like my v6 minivan with a little hole in the muffler at idle and cruise with the dump closed. I don't go WOT with the dump closed. That much back pressure would be bad for the engine.
IMO you don't want to restrict the flow at all when racing/playing with the car. Being able to have "wide open flow" and then restricting the hell out of the system with a cutout closed is the best option by far. I've dont this setup on tons of cars. My daily driver turbo lexus has a 3" DP to a 4" dump. Then I run the factory 1 7/8 4 muffler exhaust system. With the turbo and 4 mufflers you get OEM like sound levels with the dump closed. With the dump open and some drag radials, my 3750lb family car makes enough power to run 11's and is super obnoxious.
maybe try some silencers, you can buy silencers that slide into the muffler, I'm sure it'll hurt flow but it should quiet it down, maybe try youtube to find a slip on silencer that works, theres is quiet a few different designs to choose from, fairly cheap too
maybe try some silencers, you can buy silencers that slide into the muffler, I'm sure it'll hurt flow but it should quiet it down, maybe try youtube to find a slip on silencer that works, theres is quiet a few different designs to choose from, fairly cheap too
I did think about that. Never heard one in person. I will have to do a search and see if i can find a comparison. This would be the easiest option.
I had a friend take the bug around the block tonight and from the outside, it really isnt that loud. After it was 500ft away, you could barely hear it. Maybe i just need to put the rest of the interior in....
The exhaust points slightly down maybe at a 15° angle. It is a pretty good leaf blower.
I have heard that wrapping stainless exhaust is bad. Causes it to crack. I could be wrong though. My header is mild steel and coated in ceramic so that could work up there.
Why not just install the interior panels and some dynomat and see how it is then?
I think you made the panels, right?
You might not have an issue at all.
I bought some 1" wide x 1/8" closed cell foam with adhesive backing from mcmaster.com to seal panels against flanges. It might help you get a good seal.
That is definitely enough dB to cause hearing damage.
If you want to try wrap to reduce heat and noise I suggest the rattle can ceramic coat for the rest of the exhaust then wrapping it after its cured. Rust won't be an issue unless you plan on mudding or driving through rain frequently.... doubt that car is built for either.
To reduce interior insanity try extending or moving the exhaust tip to point out from under the car. Maybe even put a bend to run another muffler or splt the waves like you mentioned earlier with 3" inlet - dual 2" outlet muffler. Basically sound waves will echo between the car and street, sending pressure waves back up and through the car, sort of like dumped exhaust or open headers.
Dynamat and mass backing will help a little. I shove carpet jute into body panel dead space. Carpet jute works for Merc, BMW, Jags, Aston, Lexus, etc so its certainly good enough for my junk.
All the panels inside have some sort of dynamat on them. The only one that doesn't is the carbon hatch that goes over the engine. But yes, 113 db is quite loud.
Last edited by 70 Bug Mid Engine; Jun 30, 2016 at 04:04 PM.
Ah tips and echo don't look like an issue from that pic.
Thinking an offset muffler will be your best bet. Not sure how well the single 3 inlet / dual 2.5 outlet will cut down on the dB, only one I know for sure I heard was a flowmaster and that truck ran and sounded like ***.
I couldn't even begin to guess how it would sound on your application, but since you mentioned not considering Flowmaster...
I wanted a quiet muffler for a LS swap with long tubes, and tried a Flowmaster Hushpro because of its size/ local availability thinking it would give me space enough to run additional oval mufflers if needed. Sounded really quiet with just the hushpros, and no issue on the highway (DD 150 mile a day commuter).
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