I only have a few hundred miles on the 190.5 pulley. Seems generally to run richer since installation, but I don't have an A/F installed. I kind of think that the ECU, not being pre-programmed for so much boost, is over-compensating. Will be interesting to see when I get the tune.

The noise I was referring to (sorry, you hadn't seen my earlier posts) was not exhaust noise, but engine/supercharger noise. Mine is so quiet that others swore I didn't have a S/C! And similarly, when I took off the stock intakes and installed only high-performance cone filters (straight to the y-piece, so no silencing whatsoever), I got no more intake noise, while others also said they experienced a noticeable difference.