Chambered mufflers? Options

[dawnoforigin]

Is there any positive experience with these types of mufflers? I know most go with the straight through design, but I know they would be way too loud and not sound the way I would like. I also was considering this because I don't want to lose any low end power by getting a straight through design. Low end is much more important then high end to me. I was thinking about looking into a Dynomax Super Turbo or possibly a Flowmaster. Any input is appreciated.

http://www.dynomax.com/superturbo.stm

[Bigmeanbulldog55]

If cars don't need backpressure, then how come some run like crap, or don't even run without back pressure?

[Galcobar]

If cars don't need backpressure, then how come some run like crap, or don't even run without back pressure?
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na motors need a certain amount.....
boosted doesn't
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I take it you guys didn't actually read the entire post, then.

Backpressure happens with big pipes or small. How it happens is just different.

I'll repeat myself: Big pipes have lower initial backpressure, but quickly create turbulence (a form of backpressure) because they let the gas expand, cool and slow down.

Big pipes have backpressure.
It's the equivalent, roughly, of a river getting blocked up by ice. The engine is then spending too much energy trying to push exhaust gases out of the pipe because the expanded, cooler gas is acting like an ice dam.

Small pipes have backpressure.
Small pipes can't accommodate all the exhaust gas coming out, and it bottlenecks.

Backpressure is bad, period. Flow velocity is good, and is what allows engines to run efficiently. Big pipes mess up flow velocity by allowing the exhaust gas to slow down. Small pipes mess up flow velocity by not allowing the exhaust gas to enough space to move.

Turbos need larger pipes because for the same engine size, they pump out more exhaust gases. Which only makes sense, they're burning more fuel and air. The presence of the turbo in the exhaust stream also changes the equation, as that lower initial backpressure of large pipes is utilized in concert with the initial high flow velocity from the engine to improve turbo response -- there's a pressure differential emphasized by larger pipes.