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Though intake piping isn't nearly as critical as the actual intake runners, increasing diameter might increase overall flow, but it lowers velocity. What this means is that air isn't accellerated to as high of speeds, meaning the air is moving slower. What this will basically do, is raise the RPM of the peak efficiency of the intake system slightly. You'll loose low RPM effiency, but gain upper RPM efficiency.
But again, intake piping before the throttle has little effect compared to adjusting the runners after the throttle. Though removing too much volume from the intake piping before the throttle can massively impact throttle responce/drivability. Why? Because the computer senses the Throttle move and adds fuel before the MAF or MAP senser can tell the ECU the difference in actual air comming in (this is call transient enrichment). With less piping volume the air takes less time to start entering the throttle, causing you to go lean, and if you're running just an open throttle body there will be very little direction for the air before it gets to the throttle, so once you get above 2k rpm or so there will be lots of turbulence, causing the engine to go rich from less efficent air flow.
My conclusion: Don't spend money on those fancy over the counter intake systems, they're barely (if any) different than what you can build at home. Make your own intake piping and see how it affects mileage. If you like the results and want something a little more "official" then go ahead and buy one.
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smccall 
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