You're a fanatic when...
You're eating chili and find yourself picking out the kidney beans and arranging them in pairs on your plate.
You actually kept the original E46 sales brochure with the pictures of Portugal and have it wrapped in plastic in your fireproof box under "Important Papers."
You never use the tools in your trunk kit becasue (a) they're useless anyway, and (b) the car is worth more in five years with a complete tool kit.
You get pulled over by a cop who claims you were going 85 on the off-ramp and you say "That's all?"
The M-Tech bumper part numbers are tatooed on your wrist.