i have run a xs power also known as ss autochrome manifold and turbo down pipe for a couple of years and have not had any problems what so ever.
When they first started out they had a lot of problems due to them using stainless pipe but for the flanges they used mild steel so after a time of use they cracked. They now make them both out of stainless to fix the problem.
I know people that have run performance mild steel manifolds on s13's and have spent most of the time having them welded back together after they keep cracking........
Also you get what you pay for when using things like that, they are the cheapest on the market and are even cheaper when bought direct from the states
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