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Discussion Starter #1
I received my 2.5 header from an eBay trader, $159 shipped! It appears to be an SSAC or whomever makes them for SSAC. The mating surfaces on both the header and the downpipe (where they meet) are slightly higher, about 1-2mm, in the center than the edges. This leaves a gap at the edges about 1-2mm when the centers mate. Should I just bolt them together and rely on the bolt tension to pull the sides together and the gasket to make up the difference, or grind the center a bit and create a perfectly flat mating surface?

I'm wondering if this was an intentional design.
 

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Discussion Starter #4
I would flatten it out.
I was thinking that too. Figured if the flanges flexed over the center the welds may crack on the outside due to stretching.
 
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