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Old 03-10-2006, 05:50 PM
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Louvered or Perforated?

We're talking glasspacks here.

Louvered center tubes: Summit glasspacks, Heartthrob glasspacks, Purple hornies, Flowtech Red hots, Hedman glasspacks.

Perforated center tubes: Thrush/Dynomax glasspack as fas as I know is the only one I've seen with a perforated tube.

What is the difference between sound and flow with these 2 different center tubes?

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Old 03-10-2006, 06:33 PM
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they flow about the same, but the perforated 1's have no intrusions into the tube where as, the louvers are protrusions in the tube, I'v found louver'd 1's louder, but it all depends on the length, the longer, the quieter. I run a 31.5 2" thrush Magnum on my '51 Chevy ( 235 I6 ) and it is relativley quiet, I run a 25" 2" thrush magnum on my '67 Falcon ( 200 I6 ) and it is slightly louder, but still legal.
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Old 03-12-2006, 10:54 AM
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What are you looking for...

If you want a certain sound you better CK out other cars and trucks with those mufflers installed and see if you like the sound. Every motor sounds different and then there is the lenght of the exhaust they are on to consider.


Tazz
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Old 03-14-2006, 07:45 PM
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A louvered glasspack will flow worse than a stock muffler, they flow like 30-40% of the pipe diameters capability, however a perforated glasspack actuall flows around 70% of the pipes capability. And to add to the muffler flow a flowMASTER only flows about 60% of the pipe diameters capability. All according to flow tests done in 15" of water. So if you're gonna go glasspack go perforated definitely.
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Old 03-16-2006, 07:47 PM
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I bought a Thrush 2 1/2" in/out glasspack 28" long and I have it on my Bronco II. I also have a high flow LT1 cat on there. At idle it's a low, rumbly note, and it sounds more like a hot rod when I get moving. 3k and after it sounds sweet.
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