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Originally Posted by D.L.
After researching exhausts, I've read that ALL aftermarket exhausts have resonance problems, its just a matter of how much you can stand.
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I believe this is mostly true, but I would not say that ALL aftermarket exhausts have resonance issues. Porsche's own PSE does not have resonance issues as is also true of the other modified or valved versions of the stock exhaust you can buy.
Basically you can use a very simple rule - if the exhaust just has a straight through muffler and is LOUD, then it will certainly have resonance issues. If the exhaust is big, relatively quiet, and is engineered with resonance chambers, then it probably won't have resonance issues.
I'm not 100% sure on the name, but I believe the Dansk exhaust is simiarly engineered to the stock exhaust with resonance chambers and does not resonate. I'm not sure how my Gemballa exhaust is engineered inside, but it's big, probably has resonance chambers, and is 100% resonance free.
I think you're correct though about resonance being prevalent in aftermarket exhausts, just with these few exceptions.