Modify an aftermarket muffler?

[10/10ths]

……is part of the harmonic balance of the entire drivetrain.

If you switch to a twin tube muffler, the interior drone will appear.

The only foolproof muffler that gives good sound, but not “Fast & Furious” levels of sound, and does not drone on the highway, is the FVD Brombacher “Sound Version” muffler.

BUT, it’s super, stupid expensive.

[ike84]

Originally Posted by 10/10ths

……is part of the harmonic balance of the entire drivetrain.

.

10 is right. If you straight pipe an m96, you will experience this firsthand. There is drone (harmonic resonance). This is why the 986 muffler weighs as kuch as it does. That's the amount of steel it takes to create the resonance chambers to balance this out. Yes, the 996 has a split muffler system, but the mass of steel is the same and the only reason they used different configurations was because of space constraints.

I guess what I'm trying to say is this-Don't expect any muffler or exhaust setup to simply increase the sound by a few db. If you change one part, you change the whole system. Replacing the stock muffler is sort of the equivalent to adding water to a mogwai - you're gonna get a gremlin. Whether that's what you wanted though is a different question.



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[Robert986]

I´we tried a few... Agree that the FVD Sound version is great, looks like the OEM-thing, but actually weighs a bit less. I ran it with 200cel cats but this gave drone, removed the cats entirely and... No drone, great sound!