the 2-1 section looks standard enough but the top section is definitely not off a vti. the shape of the flange where it connects to the block is different and as you've already said there is no bolts for the heat sheild.
edit: come to think of it, someones probably just taken a grinder to it and smoothed off the flange and parts for the heatshield..
collected this today....40 quid so for engine bay dress up value i was happy....
it was spray painted but its coming off with a but of cleaning and looking nice and shiny on the 4-2 end!!! then started a lil on the 2-1 section and its nasty rusty metal so it seems elchunk was right bout the 2-1 being standard....