MM&FF did a test on a mustang with around 300hp, they swapped back and forth from a 65mm to a 70mm, and there was no difference in power, no loss, no gain. If I was to buy a Throttle body right now it would be a Holley 70mm. I had a BBK 70mm, it made the throttle sticky, not smoothe, and made driving a hassle.
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