I just purchased a GMS .61 ringed engine for that old P-40 I'm building. I'd like to use an in-cowl muffler, but Hobbico (the distributor of everything, it seems) tells me that no headers are made for this particular engine, nor have I been able to find one. My plan is to buy one that is close in size and tap it. Before I go to all that trouble, is there someone that makes custom headers that might already have one?
Thanks!