Isn't the difference between the two exhaust manifolds just the slight opening up of the exhaust opening? I thought I had seen that the castings were the same and that RARE just has the openings slightly enlarged. Seems like a home shop project with a die grinder and a six pack of beer.
BTW - Congrats Brew on the dyno run. Great numbers and best of all it worked with no drama or great problems. Max performance is great, but at the end of the day you want the damn thing to start and run reliably without issue.
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