http://www.bananahobby.com/exhaust-p...7977-prd1.html
The 79" EPO P40 have very scale P40 exaust that many at my field have used for other projects.
If you need the measurements I can take them for you .
I would post a picture but the methods used to do so on this site are just too slow for my taiste.
Those might work in a pinch. Thanks.