Isn't this essentially what Porsche did with the 930? I removed mine when I had my engine out, as have most owners I would assume. It had an fresh air pump and injectors that were in the exhaust port of the cylinder head, remove the pump and injectors and plug the open port in the head. They did not make a cleaner engine, they just diluted the exhaust.
http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/458147-air-pump-removal.html