Hey this could be a really good thread if everyone chips in a bit on what they've done and shouldnt have.
Here's mine. If you've got vents in your bonnet so you cover up your air filter with, say, a plastic bag to stop water in the intake when you wash the car, REMEMBER TO TAKE THE BAG OFF BEFORE YOU DRIVE IT!!!! Ive only had my skyline two weeks and i already stuffed up.
Need a new air filter now... laugh it up