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NoDOHC · 08-01-2010, 01:46 PM

Ted is right, it is difficult to attenuate all frequencies with a chambered muffler.

I work with constant-speed engines, so for me, resonance tuning works really well.

I have never seen a production car muffler that works over the entire frequency spectrum.

A turbocharger is the closest thing you will get

.

Still the thread that I posted explains the basic functionality, so you can pick a few mufflers to optimize attenuation without destroying performance.

The post was meant to answer the series/parallel question and the modeling of the exhaust system. Not as an exhaust selection guide.

In this case of actual performance of available options, I would defer to ReTed - experience trumps theory 100% of the time.

I will still argue that a carefully designed exhaust system could make minimal backpressure and still effectively attenuate the sound. As I pointed out in the technical section, sound attenuation does not have to cause backpressure (attenuating the AC does not effect the DC).

08-01-2010, 01:46 PM	#18
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	Ted is right, it is difficult to attenuate all frequencies with a chambered muffler. I work with constant-speed engines, so for me, resonance tuning works really well. I have never seen a production car muffler that works over the entire frequency spectrum. A turbocharger is the closest thing you will get . Still the thread that I posted explains the basic functionality, so you can pick a few mufflers to optimize attenuation without destroying performance. The post was meant to answer the series/parallel question and the modeling of the exhaust system. Not as an exhaust selection guide. In this case of actual performance of available options, I would defer to ReTed - experience trumps theory 100% of the time. I will still argue that a carefully designed exhaust system could make minimal backpressure and still effectively attenuate the sound. As I pointed out in the technical section, sound attenuation does not have to cause backpressure (attenuating the AC does not effect the DC). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)