IMO the Raceland was the best induction kit. My m8 has a £200 odd Pipercross Venom which saw no gains until the front cover was removed making it basically and open cone...
They have been discontinued though. I did find this on ebay though:
http://cgi.ebay.co.uk/CITROEN-SAXO-1...item1c1c0249d9
However I wouldn't use the red filter that comes with it because, well its shit. Get a decent green filter like this one:
http://www.kamracing.co.uk/citroen/c...roen-saxo.html
Which will fit on the kit depends on which one you want to get as there are 3 choices.
If you want to keep your car standard-ish though I would do what stevo67 suggested and get a filter for the O/E airbox:
http://www.kamracing.co.uk/citroen/c...1996-2001.html
Hope it helps,
Kurt