Hmmm, I did the bleeder T before I got a Hallman MBC. With straight BPU mods I found the bleeder T was letting me boost 1.5 kg/cm2. That's too high, of course I was dumb and ran around with the bleeder T for a little while before I installed a boost gauge. After the boost gauge was in I installed a hose off the bleeder T with a hose clamp on the open end of the hose. I would tighten down the clamp to lower the boost. Then, as mentioned I ditched that crap and got a Hallman MBC. I never did the VSV mod.