Ok so i can use my stock 6 rib belt for now cool and then later go to a 8 rib blower pulley to up the belt to a 8 rib?...How much boost will i gain by just putting the underdrive pulley on for now?..i dont know if you saw that in my last post....
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You will see a increase but you might deal with belt slip no matter how tight you get the belt. I seen with my VR4 2 psi increase. I have only owned VR4 unit which have a tighter ball pressure. This larger pulley was to cheat the factory supercharger warranty since the supercharger was not messed with. This equates to taking the 4.25" factory supercharger pulley and installing a 3.85" unit. The under drive pulley you will gain 15hp with the water pump and alternator units. This has been tested over and over in the last 20 years and is probably the best bang for the buck.
The biggest restriction on a supercharger is the intake pipe. Everything is a help when your trying to pump air into the engine.
Not such a problem on the discharge side since it is being pushed to the engine.