I made almost significant progress and was able to change the shape and curvature of the bottom part to make it look less like a plastic pipe:

Also, i added a tiny rear-air vent on the top of the engine and da titanium exhaust is overhauled (very reddit moment):

Closer:

Some other things are still left? which will be added soon, like internal details and the mechanical parts etc.

Before this, some ppl tried hard to build this type of (uh) engine, but in terms of shape and appearance, what most of them built looked an awful lot like this:

📦