[q2418130103p]

take what i say with a grain of salt, I also dont really know.

I believe one of hte few benefits of running 9b/13g combo is that they deliver their power in different power bands, the 9b will have power in lower rpms, while the 13g will have power in higher rpm ranges.

as far as what pressure to run... try a low number and go up until you start excessivly knocking (or rather when you timing starts getting pulled hard)