The results are on bummer boost and pretty sure ff posted them here.
25rwk is nothing to sneeze at for just a manifold change and increases with more boost.
I could offer a gasket but you guys already have a good one so me making one would be me ripping off someone else's hard work and thats not what I would do, just bad business practice.
Evolution of speed one is cheap and it works.
I don't think its ripping anyone off, you can just offer your own. You would be providing a complete solution, businesses pay for that all the time.
**IF I COULD MAKE A SUGGESTION** To make a Replaceable Back Fire Plate that can be changed out incase of a backfire for those running nitrous or whatever type of PI, that will insure your manifold isn't trashed and give yourself a weak link to give in those cases.