I know someone that has been a Toyota parts guy for 30 years. I wanted a TRD grill for my Tundra. They were giving him a hard time ordering it. They wanted a VIN as well. This was back in 2017.
The foam is what kills the most sound transmission. A lot of underhood noise was coming from the grommet/bulkhead where the steering shaft comes through the firewall. It sounds like the engine is on your lap. I put about three layers over it. It made a huge difference.
Acoustic foam behind the speakers and covered the doors with SoundSkinz. Even opened up the sub enclosure and put acoustic foam in there. Made a tremendous difference in sound quality. The hatch speakers are horrible in my opinion. The front door speakers could be better
https://www.amazon.com/dp/B07XMF2V77?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 , a total of 7
https://www.amazon.com/dp/B0BWCZMJ91?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 , a total of 4 rolls. I purchased 2 rolls of 1/4ā and I did get a pack of 1/4ā precut sheets.
Rolls are a pain to work with in...
This is what the drivers side looks like. I donāt know what Toyota was thinking, putting the amp under the carpet. I made an executive decision and cut a hole in the carpet. Not 100% done with reassembly, but, started the truck and revved the engine. It doesnāt sound like the engine is on your...
https://www.gs-yuasa.com/en/products/pdf/Y6_for_General_passenger_cars.pdf
It is a maintenance free battery, which is not a lead/acid, but a type of AGM.