If i had a nickle for every time ive seen one of these "im new and heres my skyline 400m" threads. Prove it. If that time is true it'd put you in the number 15 spot for 4wd 400m times on racing-line.org. The fastest skyline time on there right now is 9.040 in the number 16 spot. So thats quite a fast time you have there.
AS Daan pointed out, you better have a replay to go with that time, and email it to one of the RL Mods/Admins for verification.
If you don't have either the replay or the means to get it into the proper hands, simply enter a zero under the "Edit my times" function, save us all a lot of trouble.