62MM Ported Throttle Body & Plenum

what is the size of the stock throttle body?

The stock size TB is 57mm.
Going from 57mm to 62mm = 5mm or .200 inch bigger.
Stock ones will flow approx 480 cfm intake, 400 cfm exhaust
Ported 62mm ones will flow approx 540cfm intake, 460 cfm exhaust
 
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