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Hi Sambo,
I passed the IM240 test late last year using cats that were for an XF falcon.
The main thing is that you use quality cats and they are positioned in the exhaust close enough to the heads so they light off.
You can check this by getting a laser temp gun and check, (whilst the car is running) for a temp rise from the front of the cat to the back.
I have one if you need it.
Cheers Kyle
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