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A/R stands for Area to Radius Ratio. this is the most accurate way to determine the size of the compressor and turbine housings of a turbocharger, which assists in properly matching up a turbine for your motor.
for an F22 Accord, you're best off with a T3 with at least a .48A/R ratio compressor housing to push enough total cfm of air into the motor, and a .63A/R ratio turbine housing to give you quick spoolup and still flow enough exhaust gases to not create backpressure.
as for the rest of your inquiries, you can use the search function, as this topic has been talked about literally hundreds of times.
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