I'd go with the high flow cats. Without cats, it may be a bit stinky. High Flow cats flow great, so there is next to no performance loss.
No negative issues. With LT's, high flow cats, a good CAI and tune and you will love the way it runs.
The coating may help with the heat. Mine are uncoated which seems fine, my IAT temps seem fine using a good CAI. It does seem real hot under the hood though after parking. I may try getting them coated this winter.
If I did it over again, I'd probably get them coated to start with.
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