I recently picked up a good deal on a Unothadox racing underdrive crank pulley. I was browsing the Summit superstore open box clearence sale they were having and there it was for 50$, which i couldnt pass up. So my question is,,, with my jackson racing supercharger with a 9 PSI pulley currently on it. would installing this pulley lower my boost since I'm assuming since its underdriven that it is smaller then stock. If this is case then I'm probably going to sell it, but it would be a nice addition if the pulley would keep my boost level the same. I don't want to change the boost level at all since i have my hondata dyno tuned to that setting. Any info would be great.
Thanks

 

If you really want to use it just get a smaller SC pulley to compensate.

 

Honestly, I wouldn't even bother with the UR pulley, underdriven pulleys are so overrated.

 

How many PSI of a drop would I see if i were to install this pulley with the 9 psi SC pulley still installed.