可以到TEMU，买些沾上
https://www.temu.com/78-74x19-69inch-rubber-sound-deadening-mat-car-van--heat-shield-thermal-insulation-proofing-5mm-thick-noise-reduction-heat-protection-for-automotive-use-g-601099988382778.html?_oak_mp_inf=ELrooPqn1ogBGiAzNDJiMmUwMmM4ZmE0YzE2YTZiNjk5MzA3MDA2MThhOSCIhc%2B51jI%3D&top_gallery_url=https%3A%2F%2Fimg.kwcdn.com%2Fproduct%2Ffancy%2F39ba558c-2cab-4524-84a6-76457d73441d.jpg&spec_gallery_id=3959488353&detailDealsRecEnable=true&refer_page_sn=10009&refer_source=0&freesia_scene=2&_oak_freesia_scene=2&_oak_rec_ext_1=Nzk0&_oak_gallery_order=698268708%2C2117817305%2C1179892432%2C355593054%2C1762316523&search_key=car%20firewall%20heat%20shield&refer_page_el_sn=200049&_x_vst_scene=adg&_x_sessn_id=8utwmttdhu&refer_page_name=search_result&refer_page_id=10009_1741193187958_ymi2xabsn2
