New option for exhaust piece
While I still like the old design just fine, I think this would make another good option. I replaced the bottom piece with a metallic silver bucket which adds a nice shape in my opinion. The only down side is you cannot attach a fire piece to it whereas with the original piece you can.
I also built a real-life model which shows it's possible and I recolored it in an image editing program to give an idea of what it would look like with actual LEGO bricks.