Hi mate,
Blitz can do you the flexi section only but at stupid money.
Jap spec can deliver the flexi for £42 :
http://www.jap-spec-performance.co.uk/M ... r-exp.html
which you'll need to get welded in.
I found that the best option is to contact a local exhaust specialist and ask how much for them to get part and weld it in for you.
I was quoted £80 by a place near me (that included him taking the exhaust off the car, if you just take the flexi section in it should be cheaper), and was booked in but the poor guys appendix burst 2 days before.
Alternatively, there was a guy on mr2oc website called Dude541, who was selling a complete flexi section for not much more money, that he had had specially made for the blitz nur spec.
Cheers.