10) Colour / Paint
Although a bright yellow Lamborghini may look hot, the same colour on a Chevy Cavalier just doesn't seem to work. Also, any hue of beige or champagne paint screams "Florida Retirement" and can come off as a little lame, so choose wisely. You don't want to give the message that you've given up!
9) Stripes / Graphics
Most guys think racing stripes and crazy graphics look great on their car, but truth is if you drive a Toyota Corolla... it's a bad idea, so please don't do it. Same goes for Fast 'n Furious style stickers and flaming skulls on the hood. Even annoying or rude bumper stickers will turn most women off.
8) Music / Stereo
First off, don't try and pass that old tape deck off as being "retro" since today's technology offers Bluetooth to safely talk and drive, plus iPod integration to help set the mood. Although she might appreciate your tech savvy style, remember don't overdo it with 10,000 watts of eardrum crushing power!
7) Brand Identity
Certain car brands carry an image along with them, and although woman can appreciate upscale luxury products... it takes a very special girl to look past a guy draped head to toe in matching Ferrari hat, jacket, gloves and shoes. Think about an upscale brand that doesn't scream "look at me" but still represents quality and style.