question about muffler noise, muffler for 3sgte Options

[Needles]

hello,

im about to change my muffler because its way too loud,i have 4,5" outlet apexi

im thinking of putting the dynomax super turbo 3" in and out because i have 3" exhaust,
my goal is to keep a good flow for above 300 hp and keep it quiet as possible


any suggestion ? dynomax super turbo is good on 3sgte ?

thanks

This post has been edited by Needles: Dec 1, 2011 - 1:31 PM

[Galcobar]

Design matters, and so does terminology.

Unfortunately, marketers love to mix terminology. Particularly around resonators.

Usually, what's sold to the public as a resonator is nothing of the sort. It's actually a round-body straight-through muffler, in which a perforated pipe runs straight through the muffler, with insulation of some type wrapped around the pipe.

The 1950s version of this technology is the glasspack, which used fibreglass for sound absorption and louvered perforations to scoop up the exhaust gas and direct it into the fibreglass. It's still on sale today in the form of Cherrybomb gear. Fibreglass tends to break down and blow out, while the louvers disrupt the smooth exhaust flow -- contrary to the whole point of the exhaust system, which is to extract the exhaust gases as quickly and efficiently as possible.

The modern version of the straight-through muffler wraps a smoothly perforated pipe in a combination of stainless steel wool and ceramic matting. These achieve good results with almost no impairment to exhaust flow, which makes it much easier to increase sound suppression by using a longer muffler without effectively stuffing a plug into the exhaust as would occur with a baffled muffler.

"Turbo mufflers," by the way, are just baffled mufflers with fewer baffles. Baffled mufflers are cheap to make and very good at reducing volume, but greatly reduce the flow and efficiency of the exhaust system because thier design is based on slowing the movement of exhaust gases.

An actual resonator is so named for the technology behind the design. It is, effectively, an echo chamber, where the sound waves are bounced into each other and thus cancelled out (the sound energy is transformed into heat, and hotter exhaust gas flows better). It does reasonably well with reducing volume, but it is most effective at smoothing the tone of the exhaust. That incredibly irritating note present in poorly-done exhausts is usually because the system lacks a resonator. When a sound is unpleasant, it is perceived as being louder. Unfortunately, marketers like to prey on the well-meaning but ignorant consumers who do not understand that just because a muffler is round and goes in the middle of the exhaust it is not actually a resonator. Telling the difference is quite easy, a resonator rings like a bell when tapped while a muffler (particularly a straight-through) will largely absorb the sound and emit a dull response.

Short form:
Volume reduction you want sound suppression, so either a baffled muffler if you're not worried about exhaust efficiency or a straight-through muffler if you are. The more straight-through mufflers, or the longer, the quieter the system. Mufflers reduce the volume greatly, and smooth the tone a little.
Smooth tone you want a resonator, a real one. Resonators reduce the volume a little, and smooth the tone a lot.

This post has been edited by Galcobar: Dec 10, 2011 - 1:16 AM