I hear loud rattling from the back right corner when I drive. The faster I go, the more rattles per unit time, and simultaneously quiets down; its loudest when Im about 20mph.
It sounds as if its located in wheel well.. maybe the strut,spring, or chasis component? The shock and spring is stock btw.

Please any suggestions, Thanks!<<

 

Maybe there is some kind of crap in your wheel or hubcap? At high speed it would eventually go away. probably in some way wheel related as it varies with speed, maybe brakes or bearings?

 

also, check your exhaust and make sure its secure. Ive heard loose pipes do the same thing

 

It turns out that the back right rim was from a toyota.. So the rim fits but not exactly as a honda rim! When you look at it closely, you can even see the difference.. Honda stock rims have circular holes, Toyota stock rims have squared holes
And so the noise was the sound of the middle of the rim smacking against the bolt in the middle of the drum.

 

That'll do it.