Out of curiosity. What happened to the professional TIG welds and 4mm steam pipe?
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the welding guy will be using a tig welder hes not some dodgy guy from a backyard setup he is a proffesional welder if they exist ive seen much of his work and its nice.i showed the pictures of th exhaust that we all like and he said it will be the same but designed to sit a bit closer to the a series, when i requested the pipiing he asked weather i wanted stainless or or mild steel, i said mild steel, he said they can buy mandrel bend steem pipiing made from mild steel which he said was about 4mm thick.
Referenced Here
What is the ID and OD of the steam pipe bends used?
Looking at your pic and focusing on exhaust ports 2 & 3 your manifold seems to have a gap inbetween the to pipes and plenty of room on the outside edge of the flange.
On my manifold I had to grind a flat edge on the inside edge of pipes 2 & 3 to fit them snug together and squeeze them on the flange. Kegs manifold appears the same as mine in reference to this.
Is it just that we have used a larger ID pipe?

