In favor for CAI on EFI is that you might get a little more air in than the ECU is predicting for and run a tad leaner, whereas with WAI it can go the other way, you can be too rich without further adjustment. On carbed motors, WAI wins.
However, with modest amounts of either, the difference depends on the driver. The driver without the precision calibrated right foot, will always do better with WAI because it uses less fuel per degree of throttle opening, the driver who modulates his driving technique accordingly, can use less throttle opening with CAI and save gas. Hugely overpowered vehicles with severe "tip-in" will usually always get better improvements with WAI, EFI or not. Marginally powered vehicles may work better with CAI.
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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