Unless you are going to go back to the OEM style, run far far away from 3-bolt collector flanges. They NEVER stay sealed. I was replacing gaskets once per trip for a while. It got very annoying running a trail with a header leak, not to mention the trip home.

That said, go with the ball and cup style. It is great. Allows for some misalignment, a little bit of movement and it seals great without any gaskets or donuts.

http://www.stans-headers.com
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The ones on the left is what I am talking about.

Michael