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

[Galcobar]

You'll note I never made any comments about backpressure without an exhaust.

So, let me clarify -- exhaust systems have backpressure (except at that perfect pairing of RPM and pipe size where the amount of exhaust exactly matches the capacity of the piping). The problem occurs when the exhaust exits the engine and enters the exhaust system. It's still got all that pipe to travel through, which is where letting gas slow down is the problem. You end up with the fast-moving gas coming out of the engine slamming into the cooler, slower-moving gas still in the pipes.

No pipes, no logjam of fast versus slow exhaust.

Interestingly, it's actually possible to improve peak engine performance with a properly designed exhaust system, as it can improve scavenging (creates a vacuum that actually pulls the exhaust gas out of the combustion chamber).