Where can i get decat pipe from

I am after a decat pipe for underneath my car but cant seem to find 1 does anybody know where i can get 1 also whats the cheapest way of decating the manifold thanks
 
the 1st cat can either:
  • hollow out the current one and be prepared to buy another good condition one before MOT or
  • buy & hollow out a spare manifold cat to replace replace ur current one if its in better condition
2nd cat doesn't work as well as the 1st cat cos it usually never runs hot enough. could either:
  • replace the current one with a spare hollowed out cat temporarily until MOT
  • permenantly hollow out the current cat
  • make a decat with some pipe & exhaust flanges/plates
 
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