i was wondering if anyone could help me with the pulleys i will need for my M112 set up bc i want to run 9-10psi so im not sure if i need an underdrive or just a different blower pulley? let me know what you guys think

 

2.93 upper and 42% lower will net you around 7psi I believe. That's going to be pushing it close to the safe limit in stock internals at 10psi.

 

a 3.1 with a 25% lower should get you what you need.