With good exhaust, intake and pump/timing/injectors a NA 1.9 is knocking on stock 1.6TD power.It's delivery isn't the same, and not many folks have a truly stock 1.6TD since they are still slow.But it's a point of reference. Make sure the alignment is good and the brakes don't drag, and avoid hills.
I'm probably going to be picking up a 1Y to drop into my b3 that currently has an mTDi. The reason is that I plan on putting the mTDi into a eurovan and probably selling off the passat. What was the stock HP on these motors?