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You wouldn't get anymore than 400 - 500 cfm from a gas motor. Assuming you're talking about a typical 2HP leaf blower.
A normal 2HP, 2 stroke, 25CC engine put into a leaf blower can move air at ~100MPH and spins at what, 2000RPM peak? To get the CFM rating from that you need to do a simple discharge calculation, which is defined as Q=V*A or Discharge=Velocity*Area or CFM=ft/s * ft^2.
Stock intake tubing is about 3in. in diameter which (using the circle-area formula 0.25*PI*D^2) is about 0.05ft^2. Now converting 100mph you get 8800 ft/min. Multiply 8800 by 0.05 and you get 440 ft^3 per minute. Which is nothing. Assuming the motor can overcome pressure differences without any loss in efficiency, you'll see a 2PSI boost maybe? And this is at peak power as well, assuming the throttle of the makeshift supercharger can be combined with the car's throttle.
This is just a quick guess because I'm too lazy to sift through my fluid mechanics book to find the proper pump engineering equations. Else I'd create a make believe engine with a peak-RPM rating and back-calculate the potential volumetric displacement it can handle.
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