A pre-production prototype header assembly with specifications nearly identical to the Two Brothers Racing [TBR] 5th gen VFR 800 header is now being constructed in southern California.   This is a new thread duplicating a post on the VFRD '5th & 6th VFR 800 Header build' thread. The objective of this new thread is to give the project described below an opportunity to stand on its own four cylinders. There is a metric ton of valuable data and opinion on the old thread, so if you're