fabian is right ...you can DIY if you have the time ... the last SW quoted me somewhere around rm 300 ++ plus or so and it takes 3 days to fabricate ...and if not mistaken you need to buy they adapter and pipe from them too as the Heat shield has to be fitted with the pipe as the diameter bore at the heat shield follows the pipe ....
another place you you maybe able to do is JFA at sunway .... they seem to be more better as they will custom make it for you ...