All I can say is it’s great stuff!

Need these for an F unit project. No issues with the parts, fine casted (3D printed) in a primer gray color. Simple part to install using photos for a guide as many locomotives had this style muffler in various locations. I would suggest to any modeler making HEP pony motor equipment style locomotive to give these a try for the muffler look. I feel they can be used on other HEP equipment or power cars and not limited to F and E units.