On Tue, 15 Jun 2004 12:13:38 -0400, Pindell, Timothy wrote:
>
> The way I see it, if something so simple made a real difference, vehicle
> manufacturers would have jumped on the idea long ago. I'm a skeptic.
>
Actually, Nissan has a similar setup in their muffler on the 2.5L 4-banger
Altimas. Basically a spring-loaded valve to both increase low-speed
backpressure and reduce noise. I also remember hearing about a similar
system that was controlled by the engine computer on some crotch rockets.
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