Here is my dyno graph at 16 psi from tx2k8 from the one dyno pull I did. Car reved to 5k rpm.... and as you can tell, the power had not near peaked and flattened yet. I think it would have made.... 475ish on 15 psi, and much more had it reved enough to make more boost. 4th gear pull with 3.91's and 275X40X17's. So you figure it up, but aem says it was 5krpm.