Failed Mot, downpipe question about replacement

[Andy Smith FZS]

I noticed the part numbers were different online,
http://www.motad.co.uk/product.php?prod=...ctor+Unit.
http://www.motad.co.uk/product.php?prod=...ector+Unit

I take it would be more than a quick fab job to work.

There's one on eBay for 150 so half price on the new fsz one.

Cheers for the reply.