As much as I loved the 13B in my GSL-SE RX7, I didn't consider a rotary
in the loooong search for refitting my Syncro.  The rotary is
technically intriguing and has high power density, but IMO there's not
enough low end to be fun in a 2+ ton van.  Somehow wringing the bejeezus
out of a Vanagon just doesn't have the same draw as doing it to a sports car.

The 1.8T Audi inline 4 is a drop-in (well, physically :-) ), and offers
similar power with much more low-end torque.

ed