Car Flexing - Need Fixed

[RChillin]

Hello. I drive a 2005 chevy equinox and have 2 15s in the back. It makes my hatch door rattle and flex like crazy. I know sound deadening would be a solution but what are the steps to do so. And what would be the best solution for me. If sound deadening is so, tell me which brands you recommend or if anybody has some willing to sell, post it here please, thanks.

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[negolien]

Stringer expert isn't bad for the price.

 

[What was that? 10+ year member]

Welcome to Sound Deadener Showdown | Sound Deadener Showdown

The CLD tiles are excellent for vibrations and the butyl rope gets in anywhere to stop rattles. Sound deadening will not stop flexing. Only bracing stops flexing. If these tiles suggested are to expensive I have a bunch off Fat Mat extreme 80 mil I would let go for cheap. I planed on using the Fat mat but after I tried the cld tiles I'm decided not to use anything else.