How many CFMs does the stock throttlebody flow?

http://www.cnlperformance.com/73mm_tbirdsc.html

Our MAF's:

"This is because the 1989-1991 models came from the factory with a 55mm unit that flows 550 cfm and the 1992-1995 models were equipped with a "70mm" unit that flows only 555 cfm."



On a Mustang Forum they listed a 60 mm TB at 580CFM.

This should give you a really close estimate.
 
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