which is the best sound deadener... my bass sounds great in the car but outside it sounds like i kidnaped someone and their trying to break out of my trunk hitting everwhere making nast rattling noise

i was wondering which would be the best product...

ebay has the flatmat
eBay Motors: Fatmat Trunk Sound Deadener Kit + Free Dynamat Roller (item 120255959424 end time May-10-08 21:09:09 PDT)

i was also thinking of the dynamat xtreme
DYNAMAT NEW XTREME WEDGE PAK SOUND DEADENING * 10425 * - eBay (item 250242743815 end time May-09-08 09:30:10 PDT)

my trunk has one of those tail light that runs right across it... so yea... that makes ir worse

the dynamat is i think 37$ shiped for 4 square feet
i would wondering which one u guys think would be best... i might need to do inside top of trunk because my spolier rattles... i think its that gay break light it has one it... i tried putting silicone around it and screwing it back on but nothing... still rattles... hoping one of those products will solve my problem