Did you know that you can now change the display of centerlines for all round elbows in AutoCAD MEP 2010? The new command is “DisplayStraightCenterlines”
You can independently control the setup for Conduit, Duct and Pipe or set all of them to the same setting.
Centerline display for elbows. Select domain to change setting
The settings are saved in the drawing so if your company prefers the centerlines on Elbows to show as intersecting make the change in the Templates.
this image shows the different displays of Piping, but all other round elbows will look like this also.