Lance, I've got some of the old Moskit exhausts, but in 1/72nd. These appear to be the same thing, and if so, you will like them. I will say though that in the larger scale, and with round exhausts, the same effect can be done with a drill and paint/weathering, . . . just depends on how your time vs. money vs. talent scale is running. The beauty of the old Moskit exhausts were with square exhausts such as found on Bf One-oh-thingees, etc.

The real advantage for us and our area and era of interest is going to be with exhausts for things such as SPAD's, etc.
Warren