Exhaust diameters and joining and things

[Ben]

Adapter plate im going for 8mm or 10mm i think just need to find some lol

What thickness is the wall of the pipe you've gone for though? The only 90 degree bends I've found are 1-2 mm thick and stainless. Not sure whether you'd be able to get a good enough weld with 1-2mm ? May need a stainless adaptor plate as well unless I can find a mild bend