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mike100 · 08-06-2014

A resonator tunes out drone at a certain frequency...it is a little higher up in the rev range, not the drone you get in the hatch lugging the car in 6th gear up hills with a loud muffler set.

My experience is that headers with stock mufflers and no catalysts decibel volume-wise is about the same as a free flowing 3" pipe set with cats.

Did you see any of my posts with the C6 NPP muffler valves I installed? GM, Porsche, and BMW use this device on several cars. It works very well. This way you can run a restrictive, quiet muffler and the second outlet runs a straight shot allowing you to have your cake and eat it too.

08-06-2014	#7
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: exhaust A resonator tunes out drone at a certain frequency...it is a little higher up in the rev range, not the drone you get in the hatch lugging the car in 6th gear up hills with a loud muffler set. My experience is that headers with stock mufflers and no catalysts decibel volume-wise is about the same as a free flowing 3" pipe set with cats. Did you see any of my posts with the C6 NPP muffler valves I installed? GM, Porsche, and BMW use this device on several cars. It works very well. This way you can run a restrictive, quiet muffler and the second outlet runs a straight shot allowing you to have your cake and eat it too.