have a look at my exhaust,just a bunch of stainless steel 90deg bends,you can either cut the 90deg ones in half to get 45 bends,or whatever angle you want,over here they just sell them off the shelf at engineering shops.304 grade s/s is what i use.also off the shelf are reducers for changing diameter etc.i would also expect that most exhaust shops could source them,when i was looking for thin wall bends they had to come x usa. .9mm wall,as apposed to the 1.4 i ended up using,give it a go
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