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(mass flow rate=den*vel*area) with an increase with in area, you would need to increase flow in order to match pressures and velocity...aka your turbos would need to provide more compressed air aka they need to work harder (more volume to fill: think of compressor wheel to pistons as a closed system). or you can look at it another way, at an equivalent pressure and velocity, you will have more flow. it comes down to what do is restrictive in the system. if you are looking for a monster hp car, with tons of lag, then your system need to flow free on both ends of the turbo: exhaust as well as intake. heads, valves, throttle bodies, exhaust, intake piping, intake, turbine/compressor wheels would all prefer larger cross sectional areas or lower resistances. lower resistance and higher flow rates on the exhaust side creates higher flow rates on the intake side. higher flow rates: more power. but, for a car that prefers a quick spool and moderate hp (street), larger intake piping would more than likely be a detriment because it would essentially take longer to spool. your turbos have to work harder to create necessary pressure and velocity because it has a larger volume to fill....it is possible for your turbos to become the restrictive choke point of the system. with the increase in volume comes lower density. so, the air on the intake side is less dense because it has a higher volume to fill, it will not provide as much power because you would have lower flow rates. i am sure there are some very rich folks out there with all of their ported/polished/gasket matched runners, enlarged valves, lumpy/high profile cams, massive exhausts, enlarged combustion chambers, hugantic (one of those funny made up words like ginormous) injectors, etc. who can not max out their turbos capabilites because of the restriction the intake is causing. but, for those less fortunate folks or for those who dd their cars and do not have dyno queens or drag cars, larger intake system means more work for the turbos, and will cause a less efficient system that will take longer to boost. (this assumes standard compression ratio as well) to say the least, there are many variables out there with all the aftermarket parts available. pick your modifications wisely for the system you are going for. not everyone is suited for large laggy turbos, tens of thousands of dollars in machining, and expensive complimentary parts. essentially, pick your poison.
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