How to stop rear windshield/brake light flex?

i've had to re seal back windshield with silicone but never had a brake light like that but lots of silicone maybe the only answer.. idk if mating the rood and rear deck would much..

It's not a design made for bass

without reinforcing it somehow and risking voiding your warranty I think you're stuck

I wonder if I do a smaller setup like a single 12” in a 4th and port firing into the cab if I’ll have the same issue

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we have guy here with 2 re sxx 12's in 4th order ported through rear deck 2400rms in lexus, he says he has 0 rattles idk

If you can fire your ports forward thru an armrest hole and seal it off it should do away with any flex/vibration issues you are having. I'm running two 12's ported thru the ski pass in the rear seat and have no issues with the rear deck flexing.

There isn't to much you can do without voiding your warranty.

Use a shitload of butyl tape.

I think I had a similar problem with my ol' 626 (built lightly)... I had a set of 15's trunk walled and the rear deck and glass bounced up and down so hard it loosened the rear window. I found the window leaking after goin' thru a carwash. I already had the 3rd brake light removed, the deck was 1.5" mdf and the cabin was sealed off... all I did was cut some bracing (2 pieces) to go from the top of the enclosure to tie into the rear deck underneath as far back as possible (I just used 2x4's). After I did that the bouncing was minimized and I got the glass resealed and never had any issues after that.

Idk if you problem is similar, but hopefully that helps.

You can throw the enclosure in the back seat rather than have it in the trunk until your warranty expires.Should just have roof and dash issues then