Get a band saw... you can then build the perfect merge collector. Its very simple actually and deserves far less credit then it gets. Burns stainless ones are only complicated because they use mandrel bent pipes to put all the runners pointing in the same direction... however for a tri-merge that would fit perfectly in based on what im seeing in your pics... just some straight tube cut on a band saw with a sliding jig that holds the pipe angle consistent would be all you need. We have build them before for one-off turbo manifolds, and have a sliding jig for it. Actually if you cared to send me a cutoff of the pipe your using I would gladly run it thru my jig free of cost and return it to you so you can see what I am talking about.

But your headers seem to work great anyway, so of course i wouldnt say you should change anything about them. I was just talking about manufacturing of merge collectors.

Keep up the good work.

 

correct me if i'm wrong, but i imagine that a stroked engine would get even better gains from headers? more exhaust, right?

thanks