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You can connect multiple devices on the OBD2 bus so long as only 1 device is sending out packets to the car. You can have 1 OBD2 reader (it'll send and receive) and 1 passive canbus reader (only receive) and it'll work. However, if you have 2 OBD2 readers, it won't work since both will try to actively send and receive packets from the car.
In your application, I don't believe it'll work. I do not think an AIM or Racepak is 100% passive. I do believe they query the car for data. If you want do use both of these, I would connect your ODB2 reader to the OBD2 port and hardwire the AIM or Racepak on the canbus connector behind the radio unit.
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