Tires is definitely #1. After that the grill block, then mirror delete/swap. But like others have said, it depends on the vehicle and where you're driving. Areo mods don't mean as much when 80% of your driving is city, and weight reduction doesn't mean much when 80% of your driving is highway.
90% of my driving is highway so it's all aero for me. Next up is airdam and partial front undertray testing.
I'd love a manual tranny though...
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