there is something rattling in my door, im going to go INSANE, Dynamat? whats the best way to make this crap stop

 

Just kidding man. You havent located whats rattling yet correct? So your not sure where you need to dynamat. Are you pushing aftermarket speakers in the door, and which door?
I hate rattles man, but no matter what you always get one.

Good luck

 

Dynamat, any generic form (raammat, fatmat, edead...) should work. You should also use a foam or carpet mat to block more sound and act as a gasket for anything that is rattling. Do not use foams/carpet pad inside your door as it will be exposed to water.