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One of the issues with the cheap eBay headers, most of which come out of China, is the settings on the mandrels, which have to be precise, get out of adjustment or from wear and not being replaced start bending improperly. There is also a question about how good the welds are, how clean the interior of the pipes are especially the flange area and ports. Most of the cheap one's also don't have a splitter built in where the collection box is so not enough back pressure is maintained and they lose effectiveness. Spend a little more money and get something that has craftsmanship built into it my Fabspeed headers are built for the Tip on my '99 and don't have any bends like that in them they are smooth and fit perfectly in the space.
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