Cutout/reducer that bolts directly to header flange?

Gentlemen,
This seems like a no-brainer but for the life of me, I can't find one for sale. Does anyone make an exhaust cutout that bolts to standard 3-bolt header pattern, dumps out the diverter with a standard 3-bolt flange, and the straight portion reduces to 2.5 to weld/clamp/whatever to exhaust system?
Thanks in advance for sharing information.