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They are stainless and TIG welded, so can't foresee any quality issues!
ah but all grades of stainless steel are not created equal..... any exhaust made from anything other than 304L is not going to last you a significant amount of time.
Whilst it may say 304 (i haven't looked at the adverts) many cheaper outlets will use a far lower grade (some will even use mild steel and then nickle plate it) of stainless steel which has no place on an exhaust system.
Then if it has been TIG welded and NOT back purged then the inside of the welds will be sugared and have embrittlement and fail very quickly. The picture above shows very pretty welds but i'd be curious on the amount of penetration those welds actually have.
Then you need to question the quality of the material within the cats.....
The closer it is to the heat source (the engine, turbo/supercharger) the better the spec it needs to be.

It's cheap for a reason, the materials market on a global scale relies upon certification for proof of materials and to back up CE accreditation and it's why a lot of industry won't buy certain materials from the Chinese domestic market....

just my 2 pence worth
 

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Well yes, I agree, wise words indeed. BUT to say that all Chinese stuff is shit is a bit over the top. Remember that 30 ish years back the Japanese products were considered to be low quality whereas today they are world leaders. The Chinese are surely getting better and sooner or later quality will be good.....
I wasn’t implying Chinese stuff is shit in the slightest... I buy many things from China.... however as a coded TIG welder by trade back in the day and as a Project Director within the materials market today I think I can comment with some authority on this.
The materials alone (the correct specifications for the end product) would cost more than what the above items are sold for, without considering labour, profit margin and shipping on top....
I’ve made many exhausts for my own use over the years and well, I wouldn’t start with anything cheap and from over seas
 
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