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putting a flapper valve has been shown at various times to help bottom end and economy. I have been planning to put a flapper valve on my metro once it is built into the new body. I also planned on using 1" exhaust pipe to get the engine tuned for a lower RPM
I can't find the link on here but there was a discussion about adding a flapper to the end of the tailpipe. Jegs sells one that is pretty cheap and could have a spring fit to it to adjust the amount of pressure required to open it. Putting it at the end of the exhaust is not as good as closer to the front but I am sure it will still help out.
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