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Running 8 psi and no BAP (tuners recomendation). However, I do run the RacTronics harness. This takes voltage directly off the alternator, to the fuel pump,so there is never a current varation from lights, ac, etc.
I actually purchase a KB BAP when I got my Vortech supercharger. Vortech actually installed the supercharger and told me not to install the BAP. Since I was only running 6psi and don't plan on any higher boost, I was told it wasn't needed. I took my car back to my hometown and decided to get another opinion on the BAP from 2 local tuners. They both said that I would not need the BAP and they have seen problems with BAP and burned out fuel pumps on C5 and C6.