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I am familiar with Bogg's setup, and the main problem with that, in my opinion, is that you are stuck with the valves in one position, at all RPMS. That sound is going to be great at higher RPMs, but sound AWFUL at low RPMs. Many modern cars employ systems similar to this (Corvette, F430, etc) to gain the benefits of both a quiet exhaust for cruising and a free flowing exhaust for power.
The question to be resolved for my idea, is how to control the valves. Vacuum? Electric Servo? One hypothetical advantage of vacuum or pneumatic control, would be that at higher RPMS but low power settings, there may not be enough force to open the valves, which could be a good thing. I'd look at starting to open the valves somewhere around 3500-4000 RPM, and have them fully open by 4500-5000 RPM. This way, you are not intruding at all on cruising noise levels.
This may be a winter project.
Patrick
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Hybrid Mode
