I don't think there are any perfect engines. I would not hesitate using a pipe on any motor, even an OS. I get all of mine for about $20 and don't care. I would not mill the top of the exhaust port so the pipe works better though. I don't like to do it on a chromed liner either but would not worry about as much. There is a good chance that while you may think your SF says ABC, that it is nickel. There was a lawsuit, and they had to change that. You can tell if it is chrome by the outside of the liner. If it shows the brass colour, it is chrome. Nickel is plated all over. Oh ya, I just picked up an AX .46 for $25, (small scratch in liner :-( aww ) and an FP .15 for less than that. I am sure they will be fine. Picked up a couple pipes too. One will fit on the AX. Testing will be a while. It is hovering around freezing now.
Last edited by aspeed; 11-19-2018 at 04:38 PM.