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Was at PRI Friday. Even stopped by the ProCharger booth just to check out the latest goodies. The difference between the F1-X and the F-2 is the size of the wheel (just like on a turbo) hence the power difference.
F1-X: Inducer 4.20" Exducer 6.0"
F-2: Inducer 4.50" Exducer 6.75"
for reference
F-3A-121: Inducer 4.76" Exducer 6.25"
Have experience with a F-2 on a 540 BBC and it has huge capacity. 1108 hp at 14 psi on 91 octane with very conservative tune.
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