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Old 04-17-2004, 11:28 AM   #1
whtlegacy
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Default Another Resonator Question

I recently installed an MRT headerback exhaust (equal length headers, 2.25" midpipe, hi fow cat, MRT muffler) and it's kind of loud. I called the muffler shop about installing a resonator and they told me they had a secondary muffler they could weld into the system. My midpipe is 2.25" piping. What is the least restrictive way to quiet my exhaust down. Is there something else I should buy and have the shop weld in?
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Old 04-17-2004, 12:23 PM   #2
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Magnaflow resonator.


Worked like a charm on my RS.
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Old 04-17-2004, 12:35 PM   #3
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where did you get yours? what is the difference between a resonator/glass pack/second muffler?
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Old 04-17-2004, 12:38 PM   #4
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Make sure anything that you put in your exhaust has a perferated core and NOT a louvered core.

Glass packs also work. They do not last quite as long, but they are REALLY cheap. THe longer the glass pack, the lower the tine is going to be. THe shorter it is, the less expensive (they are all likely going to be around 10$ of each other).

If you want to quiet down a little, get the 2.5" core resonators/glass packs. These will be best for performance. If it needs to be seriously tamed, go with a 2.0" core. It is some times hard to come buy 2.25" cores, but those would be optimum.

cheeRS,

Greg
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Old 04-17-2004, 12:45 PM   #5
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ok so glass packs are cheap, don't last very long, and are not very restrictive. the muffler shop says they have glass packs in stock. what should i look for? is a longer or a shorter one better?

by core resonator/glass pack do you mean a combination of the two? where would I get one of these?
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Old 04-17-2004, 04:24 PM   #6
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The "core" is the diameter of pipe running through the item of interest (glass pack/resonator). For instance, Thrush produces glass packs with multiple diameter "bushings" (these are the short pipes sticking out the end of the glass pack, they can be expanded for slip fitting them, so are called "bushings". I don't know why.) but the diameter of the core can still be 2 inches, so the size gets smaller in the glass pack then gets larger at the exit. Ideally, you want to get a 2.25 diameter from end to end, but they don't make the core that diameter.

Here is a PDF that has all of the Thrush glass packs.

Thrush

You will see that there is either 2 inch or 2.5 inch "tube" sizes. THe tube is the core through the middle of the glass pack.

To quiet your muffler, a 2 inch core glass pack would do it well. THe 2.5 would mellow it out a bit, but not as much as the 2 inch.

If you muffler is just to loud, go with a 2 inch "tube" diameter, if it makes a sound that is head splitting, but the volume actually isn't that loud (people can't hear you coming from 5 blocks away) go with the 2.5 inch.

THe longer glass pack you get, the lower the tone. THis will give the "illusion" of lower volume because the noise isn't so piercing, due to the higher frequencies being dampened by the fiberglass packing.

I would recommend the 24201 or the 24211. I would go with the 24211 unless the muffler is just simply way to loud.

I don't know much about any other brand of glass pack. I know that Purple Hornies have louvered cores, so you need to stay away from those. Some other "generic" brand also has a louvered core, that alot of muffler shops all have. Stay away from anything that has a louvered core.
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Old 04-17-2004, 09:02 PM   #7
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24211 looks good. I'll probably order it soon. You don't think a 4" total body diameter might cause any fitment issues?
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Old 04-17-2004, 11:52 PM   #8
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It might, but it shouldn't be a problem for a muffler shop. Moving a hanger or two is pretty easy.

cheeRS,

Greg
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Old 04-18-2004, 05:37 PM   #9
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The Thrush Glasspack will last about 6 months before you blow the fiberglass packing out. Been there, done that, go for something of better quality (Magnaflow). When I first installed the Thrush it was nice a quiet, after about 8 months I had the whole cat-back removed and replaced everything with 2.00," no resonators, stock muffler.

-Charles-
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Old 04-19-2004, 04:48 PM   #10
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I went ahead and ordered the Thrush glasspack for less than $35. It's cheap, and I'm not going to sweat longevity at the moment. What do I do with it? Do I weld it into the midpipe? The spec sheet says it is 35" long.
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Old 04-19-2004, 04:51 PM   #11
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I had mine welded in right after the 2nd Cat.

-Charles-
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Old 04-19-2004, 04:54 PM   #12
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I only have the one cat just after my headers. How long is an Impreza midpipe? I know the Legacy midpipe is 3.5" longer. I just hope it's more than 35" long so I can accomadate the resonator without welding on the intermediate pipe/muffler.
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Old 04-19-2004, 05:13 PM   #13
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Have them do what they need to, to install it with a slip fit and clamps. THis way you can just remove the old one, and put a new one in should the time come (you think that it is too loud again, they still work somewhat when they are "old" when not a primary source of sound suppresion).

I had mine built in this fashion, for the same reason.

cheeRS,

Greg
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Old 04-19-2004, 05:15 PM   #14
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Oh, and it will go in the straightest portion of pipe in the midpipe.

cheeRS,

Greg
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