Using Honda's well engineered F Series header, we cut off the F series flange and adapt the header to a K Series flange. This is by far our favorite option when K Swapping your S2000. The OEM Header is built extremely well, double wall for best heat management, never cracks, and just fits like an OEM part. Requires a good Core.
Want to use that stock S2000 header? This is our preferred choice when doing a 250hp or less K Swap. Cut off that F series flange, cut the two inner runners, clock them just a touch outwards, and weld that all back together. Do it all correctly and you have perfect OEM fitment.