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Please check signature for mods and best 1/4 so far.
I am planning a dyno tune plus a lower temp thermostat in the future.
I do not want to do heads/cam, forced induction, nitros, etc. (yet). What additional mods can I consider to tweak a bit more performance?
I don't want to do any "marginal mods" (example: silicone air bridge coupler where the stock is fine for where I am now; larger TB with stock manifold, etc.).
LS6 intake manifold and then a real tune. If that doesn't help you really need to troubleshoot and figure out why you are only trapping at 108 MPH with long tube headers, an air intake, and a cat-back. You should be 111-114.