As far as warbirds are concerned, I only have a little P40 for a .25, but I plan building a larger one, for a .91 engine (Magnum) or a.72 (Irvine)... It will be a F4U Corsair or a FW190. With the latter, I may be sure the engine won't detract the scale appearance, thanks to the huge cowl. But with the F4u... I will have to build custom exhausts...