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My Z came with AMS manifolds (likely why it has a leak now).  I need to replace them and I want to get something better.  However, $3,000 for MSP's is out of the question.  Should I look at a different brand (Ash Spec?), or spend the money having a machine shop fix the poor quality of the AMS manifolds? The car is running z1 525's.   If I do have a machine shop fix the AMS could they get thermal coated or would that likely just cause more cracks because of the trapped heat. 
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