Supercharger & UD Pulleys Question!?

[Ny Mustang Guy]

I am planning on installing my 6lb Powerdyne sc.. but I just noticed something through the forums that I have read.. UD Pulleys will make the Blower spin Less Psi!!?? I just checked my Pulleys and it looks like JUST the Crank pulley and the Alternator pulley are smaller... The water pump looks to be OEM.. and so does the Power steering pump pulley.. How will this affect my SC boost wise? Im assuming I will see less boost?

 

[Daggar]

The crank pulley will affect your boost. You'll need to either run a smaller blower pulley to achieve the same boost or swap out the crank pulley for the stock one.

IMO, underdrive pullies aren't worth their cost at any rate, unless you get them to be shiney.