Quote:
Originally Posted by FrickingReallySlow
Weird, the exhaust header gaskets are the same between Gen1 and Gen2 so the holes and diameter should be the same. I wonder what interference is causing incompatibility. Maybe you need a special overripe to make gen1 headers fit or the new oil pan screwed up the routing
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The MY17-20 came with slightly larger primaries vs MY13-16 on the manifold. HKS never updated to the larger 44mm vs 41.7mm? During first gen production. Additionally if hard points are the same the MY17-20 exhaust was slightly different and fit slightly different from the MY13-16. I would wager they are just enlarging a few components like they are for the catback. Apexi and Eeecustom have confirmed fitment of first gen header.