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I didn't read all of this, but I don't know when it became a forgone conclusion that if you run mufflers, you CAN'T run a header evac system. Because that is simply NOT TRUE. I have run evacs on several muffled cars over the years and so do hundreds of other people with absolutely no issues. Every exhaust system in the world does NOT make back pressure and keep the evacs from working. That's one of those things that a guy had a problem, he told somebody, they said this, he told this guy, that guy told somebody else and before you know it, it becomes common that evacs and mufflers won't work. Except that knowledge is generally wrong.

But, to the original posters issue.....if it is pushing the breathers out, smokes out the evacs when connected, seems to me it has a lot of blowby

Monte

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Well, you should have read my first post - where I mentioned all scenarios aren't the same and I referenced full street exhaust systems as " quiet enough to be legal". Any muffler ( and I use the term loosely ) that you can look straight threw and uses a 3" I.D. pipe or larger aint quiet enough to be legal - except maybe at your track - Harleys excluded. Kinda reminds me of the pump gas / race gas thing. I pump my 110 from a GAS PUMP at a GAS STATION. Is it pump gas or race gas???