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twizyours said:I think on some cars if you increase the throttle body size it may affect emmision to the extent of not passing, atleast that is what I have heard before. Could be reason for tweo sizes. You would be suprised what 2mm can do for air flow.
Not on the FS motor it won't make that big of a difference if any at all.
You'll see more gains port matching than with a larger throttle body.