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What is the difference. Just wondering.
Perforated is like a Basketball jersey on the inside of the muffler, louvered is like a cheese grater. I will try to find pics, but the perforated will flow better because it is not only less turbulent, but the louvers cut into the air stream.

Here is a louver


Perforated


I will look for more examples, those are small pics.

Here we go!
 
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