yours will be in the manifold, only way to decat it is to buy a new 4-2-1 or 4-1 manifold
some people do it on the cheap by fitting the mk1 vtr manifold which doesn't have the cat in but the second lambda sensor needs to be sleeved and the oil filter needs to be converted to a mk1 setup, too much hassle in my eyes, just buy a raceland stainless steel 4-2-1 manifold
http://www.kamracing.co.uk/index.php...-saxo-16v.html