I did a test fit on the DLE-65, and it seems like it will work fine. I didn't have the P-51 muffler, so I had to make a cutout for the Standard Pitts. I made some mods to maximize the air outlet to help the cooling. The flap on the back helps to pull the air out, and I modified the hatch to include a vent. Opened up a few more holes in the firewall to allow the vent to help with the cooling. I'm hoping it works out well. I hate having cooling issues since I usually fly in the heat of summer.