I’ve been wrenching on cars for years, and it’s always interesting to see what trends pop up. Lately, I’ve noticed a lot of talk about certain mods that promise big gains but often don’t deliver much for the average street car. Cold air intakes come to mind unless you’re tuning everything else to match, you might just be paying for noise and a fancy filter. And don’t get me started on cosmetic add-ons like non-functional scoops or vents that do nothing but add drag. What’s the one mod you’ve tried or seen that felt like a total waste of cash? I’m curious to hear what others think, especially from folks who track their cars or have done real dyno testing.