Is your feature request related to a problem? Please describe.
I don't believe it's a problem

Describe the idea
Pipes should be able to travel through walls

Describe how you think this feature would fit in vanilla
Pipes going through walls could be a very clean way of making cool contraptions

Inspirations is a vanilla++ mod, meaning I add features I believe would fit in vanilla. Pipes going through walls is not something I believe fits in vanilla as vanilla has never been about giving you super compact structure. If you dislike how small it is inside the blocks, use a full size hopper in the wall and switch back to pipes after.