Not Ranked
The advertised reduction with the vortex cone is 1 to 3 dB and clarified by use of the word " typically "
Do not recall the source, but vaguely remember the Vortex approach is more effective prior to the muffle as pictured:
http://www.afabcorp.com/AFCO_Dynatec...rtex_conesonly
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2014 Porsche Cayman S, 2014 M-B CLA 45 AMG,
Unkown:"Their sweet lines all but take my breath away, and I desire them as much for their beauty as for their use "
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