My dad's Cadillac CTS has a V6 with canister filter; probably the same as the Camaro. It's adjacent to the LH valve cover and serviced from above.
The modern canister filters have a valve in the bottom of the housing so that when you unscrew the cap, the oil drains into the oil pan, leaving the canister empty. The filter stays attached to the cap, so it comes out with it. You get your fingers oily when pulling off the filter element from the cap, but certainly less mess than removing a spin-on filter.
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