I’ve been restoring JDM cars for a while now, and I keep seeing people slap on huge rear wings or super-stiff coilovers just for the aggressive look. But man, that wing can create so much drag on the highway it kills your top end, and those stiff coils might feel sporty until you hit a bump and realize your spine isn’t made of rubber. What mods have you tried that seemed awesome at first but totally messed with the drive?