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How is the resonator a restriction? Its simply a tube going to a chamber off the main pipe. At the rpms that ecodrivers drive at, this is not a restriction at all, neither is the filter or the intake plumbing.
Aftermarket intakes and exhausts are made for one reason, increased horsepower. Increasing horsepower means shifting torque to higher rpm ranges where it will produce more horsepower. This is what everything you have listed above does. Again, being an ecodriver means you don't use the engine in those upper rpm ranges and you now have less torque than you had before at lower rpm.
A tuned intake and exhaust may increase fuel economy, to figure this out you'd need to do a lot of testing. I have yet to see any soild testing on this (it would be a huge pain testing different diameters and lengths) but it can be done. If you wanted to mod your intake and exhaust you'd most likely go with a smaller intake and exhaust to shift the torque down to a lower rpm. This would result in less total horsepower and greater engine loads which also causes the engine to be used at lower BSFC rates which increases fuel economy.
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