I figured it's time to start a new "official" thread to compile a list of known rattles and fixes. I'll start with one I recently found. The license plate light- the clear lense fits loosely and rattles with the sub. All you have to do is unclip it and add a few strips of electrical tape to the back to make it fit snug.

Can't forget the dreaded, but often forgotten spare tire nut.

OMG I keep hearing a really loud metal hitting metal noise! I put the car on jacks and searched with my friend and nothing!

There is a rattle/squeak that can be caused by a dry hood latch. Spraying it with white lithium grease will fix it.

How can we forget that one??? Seems like every tool with a rattle has a loose spare tire nut, while all the owners suffering from real problems never have a solution.

ROFL rattle. damn after all my mods, my car has rattles here and there. but i have taken a lot apart and put back together throuhout the years. its never like it was new

turn the radio up and drop the top, works for me

With a loud 70mm single, everything rattles-- you get used to it

If you include squeaks:

Late model AP2 passenger seat rail squeak. Grease.
Seat belt on top of seat leather squeak (AP1 usually). Felt sticker.
Hardtop seal rubbing on rubber body liner (back). Silicone grease.
Trunk tray rattle with sub. Remove tray or dynamat.
Underbody rattle from broken cat. Replace cat or test pipe.
Soft top latch rattle when top down (and under hardtop). Velcro strap the hooks flat.
Soft or hardtop front latch rattle. Dental pick + foam in the sides of the latch.

when i have my seats moved all the way back, the back of the seat (plastic part) rubs up against the roll hoop and rattles slightly.

also, the passenger safety belt will rattle if its left to bounce around the door trim.

I think I might have the AP2 seat rail squeak you're talking about. I did a search but didn't come up with anything. I get a chirpy sort of noise when I go over rough roads that seems to come from that area. Does this sound pretty similar? Thanks