The supercharger pulley boost thread peaked my interest. So, lets post boost results for the 178 crank pulley. I logged (OBD2) boost the evening of the 28th of september with a DA of 1900 and this is what was logged.
Max boost in 1rst: 15.9 psi from 4450 rpm to redline
Max boost in 2nd: 16.9 psi from 5400 rpm to redline
Max boost in 3rd: 17.4 psi from 5500 rpm to redline
After shifting to 4th until letting off was 15.8 psi. (12.022 @ 116.12)
I broke the boost sensor installed in the intake manifold a few months ago, but I'd seen 19 psi a few instants and usually mid 18's. Unfortunately, my SD card with all the history with the Code3 pulley, stock manifolds, Needswings manifolds, headers, etc. somehow got corrupted and had to be initialized resulting in tons of lost information. So, in the interest of posterity and the lack of permanency of SD cards., post up or loose it for eternity.

Les