Opinions please- new hemi or 408?
All honesty it's a bunch easier to deal with a 408, in installation and troubleshooting.
And to be politically correct it's not a hemi-sphere, really, it's a pentroof, which doesn't sound as sexy.
If your really all about the 'hemi' name, just slap a sticker on it.
10/10 people won't know the difference when you pass them.