i think its something like 12.75 or sumething?? sum1 can clarify, but yeah if ur running at 9-10 its def under. With the car you have i wouldnt boost iot over 15psi especially with a manual boost controller as you will get spikes, boost cut is at 17psi and you dont wanna hit it, it gives a sudden jolt to ya car and doesnt feel good. So yeah 15psi n you should be right, just t obe safe from spiking boost.