I am trying to put the dollor mod on my brothers SRT-4. This is what I have done: put T in black 1/4" line off of compressor housing. branched from there to another T. one side from previous T, one side to waste gate, 3rd side with a rubber cap withsizes varying from pin hole to 3/16" hole with no difference in boost. I can only get to 5 psi. Whats wrong? I capped the original line off of waste gate.