There's de-cat pipe on eBay. Doesn't look like a 172 one, however i thought the 182 one was straight?
Link:
http://cgi.ebay.co.uk/Clio-172-182-...286.c0.m14&_trkparms=66:2|65:10|39:1|240:1318
Link:
http://cgi.ebay.co.uk/Clio-172-182-...286.c0.m14&_trkparms=66:2|65:10|39:1|240:1318