I am in the middle of upgrading a number of things on my '84 300D and first on the list is rebuilding the turbo. I finally got the turbo out of the car and dismantled see photo
https://picasaweb.google.com/lh/photo/smFILkZxVtBea0tisRZ12NMTjNZETYmyPJy0liipFm0?feat=directlink
The turbo looks to be in excellent shape with some evidence of oil seeping past the seal on the exhaust side with some carbon buildup under the heat shield.

I bought an "upgrade" Stage I turbine wheel that has the exact same dimensions as the stock wheel, except for the inducer (major) diameter. The inducer on the stock turbine is roughly 2.5" and the inducer on my new wheel is 2.3" , see photo:
https://picasaweb.google.com/lh/photo/8Ep2AbbvsH8Dz-uVx0-9tNMTjNZETYmyPJy0liipFm0?feat=directlink

So my question is this:
All other things being the same, will an exhaust turbine wheel with a smaller inducer (major) diameter give faster spool-up but lower max boost?