Nice ! Leave plenty of bolt hole clearance with 304 flanges.. otherwise they shear bolts off !
These are by far the nicest flanges I've seen for a v6. The hole positions and consideration of the planned tube size is spot on. The reality of it is there is no way to produce a one size fits all flange especially if tubing size is going to vary from car to car. I've handled plenty of shitty flanges over the years. Those copper flange gaskets are just as shitty as some of the flanges. Holes aren't in correct location for S2 head.