The main difference between the X7 and X7 Phenom is the FlexValve technology employed by the latter. To simplify, the FlexValve allows the X7 Phenom to operate at under 300psi instead of over 600psi as the X7 would.
The main difference between the X7 and X7 Phenom is the FlexValve technology employed by the latter. To simplify, the FlexValve allows the X7 Phenom to operate at under 300psi instead of over 600psi as the X7 would.