It is a shame but unless they changed something on the 2020 (mine is a 2019) it think this is a fundamental design flaw of the hardtop. The 4 door hardtop acts like a sound wave when going over small bumps, like a drum. The top doesn’t have structural reinforcement to prevent the sound.
Yes, I fixed that issue with this stuff: Second Skin Damplifier Premium Car Sound Deadening Material (40mil) https://www.amazon.com/dp/B01AMNKR5M/ref=cm_sw_r_sms_c_api_i_gfuIDb00ZXDP0
Does it go under the carpet? This stuff looks like a really good idea.
Yes it goes under the carpet directly on the metal. Roll it on and it absorbs almost all vibration and sound. You’ll see FCA puts material like this in spots along the Jeep floor, just not enough of it, especially around the wheel wells. it does the trick.
How much does it take/did you use?
Is that a pool noodle? Solid or hollow foam? Where did you get it?I noticed the hardtop buffeting sound the first day home and ended up with this long term fix. A 3ft by 3inch round piece of foam. It secures the hardtop on the two ends with pressure and eliminates the buffeting entirely. I later inserted sound inserts as an extra measure but this foam roll did the trick to stop the buffeting.
Got it here, it’s solid foam: CanDo PE White Foam Roller, 3" X 36" Slim, Round https://www.amazon.com/dp/B001RQ3VBQ/ref=cm_sw_r_sms_c_api_i_ZbRIDb0TS6YWV
I have a JK and used a similar product on the entire Jeep other than the doors which are a giant pain in the ass. I used it on the top as well and my Jeep is as quiet as you can make the Jeep. If I could do the doors easily I would do them as that makes a huge difference.
Like you I have a TON of wind noise in the front windshield passenger area.
