What is the true gain from this t-bird turbo upgrade. Ric from racing mazda is telling me that the upgrade is good for 250 whp, but he did not say what boost. Its on a new motor and I am hoping for at least 15 psi. Also I have a 2.5 inch full exhaust and a hollowed out cat. When the rebuild/upgrade is complete I am going to buy the 2.5 inch down pipe and new injectors. What do ya think turbo gods?