I just had the 620 upgrade installed. I have to congratulate vf for designing a perfect interchangeable kit. Makes for easy upgrade from 540 to 620. Open opening the box I noticed that only parts in need of replacement was the pulley and belt from current 540 kit and the addition of inter cooler and heat exchanger with a water pump and a proprietary reservoir. I did notice the pulley is about 2 mm smaller which should equal in 1 psi increase but we will wait to verify with my p3 gauge. Once again Jeff and Robert many thanks.
Vf supercharger + tune/H&R coils/ Akra evolution exhaust/Volk te37/ Rs-3 tires/ Brembos /TIal BOV/ OSS blacked out headlights/LUX v3/Led taillights/ Challenge Front lip/ P3 vent gauge/ F10 m5 shift mob/Matte black front grills/ And a funky air fresher