my gsr is making high pitch rattling (fast) sound from the passenger side in the engine bay when increasing speed (speed doesnt matter- slow or fast). it's completely stock (no mods such as an intake, header, or exhaust). there's also no heat shield as well. dont really know what it could be but its bothering the crap out of me. help. thanks

 

Try checking the bolts from the headers to the cats. If they are blown, there you go. Mine did the same thing, I just got the bolts replaced and the noise was gone. Good luck.

 

does it happen when u rev in neutral too? or just while moving.. if it's while moving it could be your wheel bearing