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Absolutely better things to do with $400. Opening up your exhaust, getting your intake flowing better...
Gear swap...would most likely exceed $400 in the end, but I don't care for tuners unless you will be getting a dyno tune. So many members here have found to have put down higher numbers on a stock tune vs a canned tune that comes with a tuner.
What exactly does dyno tuning do? With my mods, if I took it into a dyno tuner, they would set it up on the dyno, make a couple runs... then what? What kinda stuff do they tweak besides A/F Ratio? Would I get some big gains?