Can you share an intake and exhaust pipe?

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Nope, not good, you’ll be trying to re-burn exhaust gasses that will have little oxygen in it.
Could you post pics? There are some high efficiency exhaust systems that have an exhaust pipe sealed with an air intake pipe around the outside of it so the air is warmed as it comes in.
 
Here is an example
 
Here are some pics of before and after I took the hose off.

After taking the hose off I definitely feel cold air coming through the pipe

Can you share an intake and exhaust pipe? Can you share an intake and exhaust pipe? Can you share an intake and exhaust pipe? Can you share an intake and exhaust pipe?
 
Ok, yes that’s the correct way, it’s a high efficiency set up by the looks of it
 
Yeah for sure! And not a problem, stay warm!