Librands advertise exhaust headers that go straight out of each side, rather than crossing over underneath the sump like they used to - see http://www.librands.co.uk/products-category-26.html.
Another possible source is RPI Engineering - http://www.ebay.co.uk/itm/Morgan-plus-8-...item2c7463cfee.
Not cheap though.
This side of the pond they are called exhaust manifolds - if you Google "exhaust manifold 4.6 Range Rover" you will find a selection of cheaper alternatives.
Hope this helps.


Fjemog

1993 Plus 8