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plated for extra protection and durability, we at RZTperformance found that this is one of the better material to make them from has far has cracking is concern. we know what it is like to have to pull a motor just to fix manifolds not to mention the expense for the customer, has for testing these are not a newly found product it has been used for years, I've been using these manifolds on my car for the past year, made multiple 10 second passes, daily driven etc.. and I've yet to see any problem. , not to mention the cost.
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