hi, i have the hallman pro mbc. i turned it a few cranks to try to raise boost to 8psi but it wont go over the stock 6psi.... am i doing something wrong? its all hooked up right and i have good vac reading on the gauge.

 

do you have it inline with the wastegate and the compressor housing?

 

how is your spool up could it be a leaky turbine to manifold gasket this will limit your boost and slow spool considerably. also as mach929 said is it between the boost source and the WG?