I bought a 25" Dynomax Thrush Magnum Glasspack Muffler. I've heard a glasspack will make the exhaust louder, I've also heard it will make it quieter. Well, it can't be both. Which does it do.?
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makes it quieter to get the raspyness out of the exhaust.
bigger it is more raspy it takes out
What people usually do is put the glasspack between the cat and the muffler. Just the glasspack alone will be a little loud but it'll be smooth. The muffler will make it quiet. Or atleast that's the going trend. I don't have a glasspack on mine, just an HKS muffler and other than an unknown mystery rattle, my car just sounds mean when I get on it. Quiet and smooth when it's at idle or cruise, barely louder than stock.
Thanks guys. Is there a difference between a resonator and a glasspack? Again, two different things.
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ok a glasspack is a resonator...
There are two kinds of resonators, a glasspack, and a leuvered sp? core. The glasspack will flow the best because it is a straight through design. Back in the day muscle cars used to run just glasspacks to make it loud, on our cars you would use it as a resonator to smooth out the sound of your muffler.
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technically a resonator is not equal to a glasspack. A resonator is a tube within a tube and there is no fiberglass packing to absorb sound.
There are three ways of quieting an exhaust. One is absorption, another is reflection, and the third is through velocity reduction. A chambered muffler does the third...it has a large chamber in it that slows the velocity of the exhaust gases allowing them to die out. A muffler with angled baffles (flowmaster) quiets using reflection. The sound waves are diverted by the baffles and cancel each other out. This is the most restrictive of the three. A muffler with fiberglass packing or steel wool quiets via absorption. A glasspack uses the absorption method. It has a straight through core with perforations or louvers in it to allow sound waves to be absorbed by the packing. A true resonator is a chamber type muffler. There is a tube inside to keep exhaust gases flowing towards the output, however the case is larger and the area between the core and the case allows the gases to expand a bit and slow down, thus allowing certain frequencies to die out and not continue on. Absorption mufflers usually do not quiet the exhaust as well as a chambered muffler, however chambered and baffled mufflers disturb the exhaust flow so much that they are not the best performing mufflers. Most stock mufflers are chambered.
A glasspack can be placed between the cat and muffler to allow more sound absorption with minimal flow impedance. So you lose some of the frequencies of sound and don't disturb the flow. If you use a louvered core glasspack, the louvers do disrupt the path of the exhaust gases, so there is some power loss there compared to the perforated core glasspack.
I just wanted to post a little bit about how a glasspack is not technically a resonator and I ended up rambling on. Sorry about that.
I have used glasspacks where the resonator should go and they work very well in reducing raspiness in exhausts and really mellowing out the tone.
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