lol i run 15 on a stock engine
i would say 9psi if your totally scared/anal about breaking stuff, and 11psi otherwise.
But it really is all in the tune Timing and A/F play a BIG role
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'94 v6 Mustang
Custom twin turbo kit by Justin @ vmp
Split port engine swap from a 2000 v6 mustang
388whp 435wtq
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