I notice a slight difference in handling when I take a passenger in the car. I'm not serious enough to kick them out because I want to do slightly faster times, I will even take strangers for rides if they ask nice.
And the little things add up, once I removed the stick on sound deadening, all uneeded wiring, uneeded brackets, the heater/ heater lines, AC lines etc etc the car weighed a lot less. Unstreetable but light
