Right, I'll explain. The manifold has a fluted styles end with a loose flange. The adapter plate I'm talking about bolts directly on to the de cat flange and is exactly the same size and shape etc. There are holes drilled into the adapter flange to match the holes on the loose flange on the manifold. In the fluted end of the msnifold you put one of those tapered exhsust bush thingy mibobs, and the adapter plate fits onto that which is all fine. Problems start when you try to tighten the bolts in because they bottom out on the flange of the de cet pipe. You can't cut them as the two flanges are