Larry,

I have a few fiends that have the FPE 24. They really like it. I do not know anyone that has installed it in one of our planes yet. As far as I can see, I do not think any firewall changes would have to be made. I would recommend a little more support, but that is about it. In response to your question regarding correct cowl placement, the proper distance from the firewall to the prophub is 5 3/4" I hope that I have answered all of your questions, I will be in touch Saturday evening with the flight report for the 3W (weather permitting, if it rains, we will do it on Sunday) Talk with you then......

Jim