Heres my 16 escalade with whipple 2.9. 6.5 psi boost Headers Cat back On 26s Very fun blower on this 5800lb suv. For my z06 i will start off wuth a pulkey thats same psi as stock. Then go 2 more psi and dyno then go another 2 and dyno. The 2.9 at 13 to 14 psi is the sweet spot.