Yes I have and the power and torque output did not differ. On the road however the car felt a lot more responsive. and din't keep wanting to stall.

KE-Jetronic does not like air leaks which the DV essentially creates. Why spend cash on something that is not needed and 9 times out of ten causes problems?

I would urge anybody with a dump valve on a KE_jetronic equipped car to do the only sensible thing and file their dumper in their spares drawer