TB spacers are a joke on newer throttle bodies that pass only air like the TJ uses. Spacers work well under carburetors and first-generation throttle bodies that had a fuel injector in them (called throttle body injection or TBI) since they pass a wet air-fuel mixture. A spacer doesn't help in the least when mounted under a modern TB like the TJ uses. The TJ's fuel is injected well below the throttle body.
CAIs are way overhyped. They sound good in theory but they're still not putting cold air into the engine, it is only slightly less hot. Only those with a highly-developed susceptibility to the placebo effect would notice anything. My present TJ came used with a CAI and I removed it so I could go back to the factory air intake with an AC-Delco air filter. No performance difference, cleaner air for my engine.