What if you're on 40s? Not sure how my statement is flawed. Never said it's against the law to run stock gears lol. All im saying is there's a risk and that better mpgs/power aren't the only benefits.
To everyone saying they dont think regearing is worth it... If you put on bigger tires you need to regear or you risk damaging your engine. Doesn't matter if it still feels like it has enough power. Here is a guide on what gears to pick based on your engine and tire size...