Quote:
Originally Posted by Bmw135er
The stock manifold has a tapered collar on it that holds the o ring gaskets in place. As you tighten it down, they are forced on to the larger end of the taper and seal outward against the head. I think I recall seeing this tapered sleeve on the inside of the single manifolds? Not positive on that though.
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The Vishnu/FFtec single turbo kit has sealing rings that go into the head, just like stock.