It seems to me that you could accomplish the same as Extrude Hone with a wet sand blasting set up.

I can't remember the name now,
but I am pretty sure I had a small electric pressure washer (German ?) in the 1980s that came stock with a nozzle that would suck in sand and blast it out with the high pressure water.

a quick Google search found this:

http://www.pressureparts.com/None-C-SandBlas-Pressure-Part-391510.aspx

I admit that it would be hard to get even an extra long shank carbide burr inside some of the exhaust manifold passages but the wet sand blast nozzle should work