Time for the T58 to find a new home. I'm going a little lower on the CR with a thicker MLS head gasket. With this and the h20/meth at hopefully 25 psi on pump gas I should be around 500 at the wheels . It's a P trim .70 a/r. Got it cheap, just needed seals.
Heres'a comparison of the compressor wheels. 280ZX wheel, CT26, T66.