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Exh Syst Replacement (continued) - the Quest for Quiet

I was thinking that also. I have a CCLB so could fit them in somewhere, just wonder if its worth it.
 
Has any one compared the sound of the louvered mufflers mounted in both orientations? Just wondering if it makes much difference which way they are mounted.
 
96 OILBURNER said:
Has any one compared the sound of the louvered mufflers mounted in both orientations? Just wondering if it makes much difference which way they are mounted.
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If you mount a muffler with louvers that point into the exhaust stream, the orientation makes a tremendous difference. With the open end of the louvers catching the exhaust flow, it reduces the flow and the noise considerably. Turning it around so the exhaust flows over the closed end of the louvers the flow is much higher, but so is the noise. Its a trade off with an open glasspack type muffler, you really can't have high flow with noise reduction.

If you want to read a pretty in depth article on exhaust, Click Here . Its more geared to NA gas V8's, but is interesting none the less. Its by David Vizard, probably the best technical automotive writer there is.
 
Burning oil said:
I was thinking that also. I have a CCLB so could fit them in somewhere, just wonder if its worth it.
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Resonators are little, mini mufflers. They look identical, just shorter. I took my cat off and welded up a resonator in place where it used to be since its nearly the same size. The muffler is in the stock location, toward the rear axle. I can tell you that it does make a difference with noise. I have no droan, at all.

Its like having two mufflers on there, just one is shorter. The truck's gonna be quieter with the added resonance.
 
Unit453 said:
Resonators are little, mini mufflers. They look identical, just shorter. I took my cat off and welded up a resonator in place where it used to be since its nearly the same size. The muffler is in the stock location, toward the rear axle. I can tell you that it does make a difference with noise. I have no droan, at all.

Its like having two mufflers on there, just one is shorter. The truck's gonna be quieter with the added resonance.
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Simple and effective suggestion. Thanks Unit.
 
I am reading a lot of comments that is now making me question the warpspeed or diamond exhaust. I am looking at getting either with the straight through muffler that is included. The noise when revving the motor or under hard acceleration will not bother my wife but it will if there is a drone around 60 to 75 mph (2000 to 2500 RPMS). Do any of these exhaust have a drone with just the muffler that is provided?
 
Thanks Nick.
Im going to try something allitle different, as an experement. I have a 3" DP to install then cut off the cat & muff (straight piped). Use the same size pipe as stock after DP.
Back in 93 I did this on my 3/4 ton (no cat) and it sounded very good and got 1 MPG better. The best I ever got in that was 26 mpg!!
 
I have two Aeroturbine mufflers inline and exhaust velocity is incredible at idle

Plus it shoots out the side before the rear tire.

It is loud still, it is the 4040 and 5050XL and a 6" tip.

So I do not recommend this setup if you want quiet, but if I just left it all 4" going out the back it would probably be good and it did seem to increase velocity with 2 of them.

A short 4" muffler fits fine between my tranny crossmember and the rear crossmember as long as its only 6" diameter or "tall".

I have a small 4" eliptical chambered one to replace the AT4040 soon. Will let you know how it does.
 
drocker said:
I am reading a lot of comments that is now making me question the warpspeed or diamond exhaust. I am looking at getting either with the straight through muffler that is included. The noise when revving the motor or under hard acceleration will not bother my wife but it will if there is a drone around 60 to 75 mph (2000 to 2500 RPMS). Do any of these exhaust have a drone with just the muffler that is provided?
Click to expand...

Based on what you said I think you'll like the Diamond Eye. I was worried about noise, have kids in the Sub all the time and didn't want it loud on the highway. Mine is rumbly at idle, loud when accelerating at slow speed, a bit loud at 35-50 mph type speeds but not bad, but once at highway speeds it quiets right down, almost like you outrun the noise. At 65-70 mph there is more engine and tire noise than exhaust noise.

If I ever change for a different muffler (and this thread gets me thinking!) it will be to quiet it down at slower speeds.
 
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