2007 still has hydraulic power steering, huh? That's low-hanginging fruit. I'd take the tire pressure up a bit more too. I tend to run ~45-50. Maybe some more underbody paneling.
I'd avoid any undamped crank pulleys. You can probably find a real underdrive damper, but easier (and cheaper) would likely be individual underdrive pulleys for the various accessories. An undamped pulley is likely to eat anything connected to the timing chain, especially oil pumps, and may also increase wear on bearings.
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