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You can buy an already decatted pipe on web for around $150, or take yours off, and drill out the cat material from where the slip-on's attach.
Search on this forum for illustrated instructions.
I have the same set up as you except 3/12" slipons. I just gutted the cat and used the factory head pipe.
If you look at the Dyno charts on Fuel Moto's page, there is a comparison between a Jackpot head pipe and a stock '09 (no cat in the '09), and there is only 2 hp difference in power. 2 hp would not even be noticed while riding and a gutted cat is near free, compared to near 500 for a head pipe.
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