@swbradley just tack it with an mig making sure it was square and plum, then TIG it up.
But you can MIG it no problem.
@patracy yeah there is a lot of other issue that I have not addressed yet,and probably will not get that deep. I have went though some small hole maybe 24-36 inches just made it harder for the guys in those little jeep Cherokees LOL
@jdkneck sure no problem it was a 10inch long 4inch I.D elbow , and 24 inch long 4inch I.D. Straight piece. Exhaust pipe used factory clamp on breather assembly and purchased on band clamp but any will do .
welded elbow to straight piece and clamp the hat to the end also to breather assembly.
Thought about add a brace rod for tube to exhaust that clamps maybe later just going see how it acts,it's not heavy.