muffler help

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mopardemon340

mopardemon340

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in the next few weeks i will finally have my 408 magnum ready to put into our demon. we have doug's headers and would really like a muffler that would give us great sound.. we will also be running 3 inch exhaust all the way out. any ideas on a muffler
 
mopardemon340 said:
-- i will finally have my 408 magnum ready to put into our demon. _ _ _ _ _ .. we will also be running 3 inch exhaust all the way out. any ideas on a muffler --
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-- I had that set-up, in a 69 Valiant. -- I tried Flowmaster 40s -- way too much drone. -- I settled for some basic turbos. - They sounded fine.
 
I had this same question. I really like the sound of the Flowmaster (which I had in 2.5 inch) but in the end went with 3" Hooker Aerochambers which give me a rich sound and great power.

aeroflowscutout-jpg.1714999875.jpg
 
for everyone who put exhaust on what configuration did you use center/ center, offset/offset. or center/offset. 72 demon..
 
Off set in, center out.
Off set in close to the center of the car.
 
I run TTI's with 3" front to back with an H pipe. I use Borla XR-1 mufflers.

These give a nice deep sound at idle and normal driving. Minimal drone. They aren't loud until you really get on it. They flow great. I go 11's through the mufflers. I also dyno'd it through the mufflers.
 
Any type of straight through muffler makes the best power, but will also be a bit louder.

 
Car chemistry inserts and skip all that. If you want to run the exhaust all the way to the back, just get the slip in insert.

You can adjust the sound of the Car Chemistry muffler. You can make it louder, or quieter. And it's simple and light.

Everything else is a space eater and adds weight.
 
yellow rose said:
Car chemistry inserts and skip all that. If you want to run the exhaust all the way to the back, just get the slip in insert.

You can adjust the sound of the Car Chemistry muffler. You can make it louder, or quieter. And it's simple and light.

Everything else is a space eater and adds weight.
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Yeah right if you absolutly need a restriction that robs power thats a good idea.
 
1Fast340 said:
Yeah right if you absolutly need a restriction that robs power thats a good idea.
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There is no such thing as a muffler that is quiet that doesn't hurt power.

You ever use a CC muffler? I use them all the time. If your stuff is sized correctly, you can make them fairly quiet without a significant power loss.

If you think mufflers make power, think again. There is no such thing.
 
yellow rose said:
There is no such thing as a muffler that is quiet that doesn't hurt power.

You ever use a CC muffler? I use them all the time. If your stuff is sized correctly, you can make them fairly quiet without a significant power loss.

If you think mufflers make power, think again. There is no such thing.
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Correct, mufflers dont make power but they can certainly rob you of power that you have payed alot of money trying to find.
By inserting something into your exhaust tubing that makes its flowthru area smaller you create a restriction, larger tubing to overcome a restriction are not what i consider a very good deal.
Had a customer with a bigblockpowered chevelle bring a set of insert in for installation many years ago when i worked in the exhaust bussines,i had my doubts but he insisted,i made sure the inserts could be taken out if need would be he was not happy and he described the car as running like garbage after testdriving his car with the new exhaust and blamed the exhaust i built for his car,i ended up uninstalling his inserts and he got the power back. That was with about 450HP and a mandrelbent 2½" dual exhaust with some nice straight thru mufflers,Yes 2½" ís the correct diameter tubing to use at that power level if you want to keep your car toned down without loss of power and that car ran realy nice. Im sure you can lessen the problem running larger exhaust tubing but that may come with other isues. And yes im avare 450hp is about the limit of 2½" and that where 3" starts to make a god difference outside of giving a different tone to the car.

Edit: ofcourse this is depending on enginecombination and tubing diameter,who knows the experience i had may be due to the combination of parts and the fact that the exhaust was already on the limit and the fact that those inserts (made for 3"exhausttubing) where put very close to the collectors on the customers request, in a section of tubing with a long transition into 2½" tubing. the long transition was not the customers request it was just the right thing to do.
 
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Can't beat the sound of 3" flowmaster super 44's dumped. My neighbors may say otherwise in the mornings. Haha
 
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