Frank I (wrongly) thought you were doing this when you were playing round with Toyota corolla manifolds, I was kinda hoping you mighta run with the idea. 
http://www.micra.com.au/community/message.php?messageid=69926 Search for ACIS ACIS is toyota's name for it, no telescoping manifolds but at least enough to do something useful?
Anyway the spacing on 4EFE, 4EFTE, 5EFHE etc is close enough to the micra spacing and they are a relatively suitable size so could be cut and shut...
Here's the links:
http://board.tercelonline.com/viewthread.php?action=printable&tid=23606 (Shows the various available ACIS and non ACIS manifolds)
And here's how to make it switch over and tune it:
http://tercelreference.com/articles/acis_activation_options/acis_activation_options.html
It actually seemed reasonably simple from memory.... It's not gonna fit my mini so someone go do this!
