Got a couple of questions that I'm sure a lot of you know the answer to. When doing a vacuum conversion on an 87 GN, which vac. booster works the best, the single diaphragm or the dual diaphragm? I'm pretty sure both will stop equally well, I'm just wondering if there pros and cons to either one? Also, can the turbo brake pedal be modified simply like just drilling a hole or should I just get one out of a NA g body? Thanks in advance for any input you can share. HS