Is it possible to remove the stock wastegate from this turbo without changing the housing?

 

yes.

 

looks like a saab t3.
if you want to run an external wastegate, you would need to get a 5 bolt block off plate for the downpipe.
if you want to rotate it, you can use any two bolts on the back of the compressor housing. and/or drill extra holes in the wastegate actuator bracket.

 

here is another picture of it. will I need to rotate the cold side to line up the charge pipes for a Honda setup?

Do you know where I can get a 5 bolt block off plate?

 

what honda and what type of manifold?

 

'93 Del sol Si and a Drag manifold shown below

 

Oh, i forgot to mention the engine is a B16A