The leviathan exhaust is 8 decibels higher than the stock exhaust with cat at 4k. Check the videos for more info. https://remnantperformance.com/products/mkv-supra/the-leviathan-turbo-back-exhaust-for-the-2020-a90-mkv-toyota-supra-gr-3-0
1. From what I've read about for issues with the mkv is horn is embarrassing since they don't have both high and low pitch horns which is a fairly easy fix.
2. Wind buffeting....which can be fixed easily. They can cost between 5 to several hundred depending on your taste.
3. Door lock rattle...
I would get a jack out and remove your tire and look for debris behind the rock guard. Try spinning the rotor and see if you can pinpoint the noise location.
From pictures I have seen the awe sits lower than the leviathan. I'm waiting for my leviathan exhaust to show up right now. 2 things to note about the leviathan exhaust is you can't run the metal brace in the mid/rear of the car and you need to cut a small section of plastic by the rear wheels...
If its a 12 volt I would recommend the big battery. I have lots of the milwaukee tools for automotive work and love them. One tool I do not recommend is the straight die in m12. It over heats fast and cuts out. The 90 degree die grinder is amazing.
Yeah you should have a few more years left on your bumper to bumper warranty. I kinda wonder if they didn't code it right. Well whatever the problem is whoever did your PDI needs a talking to. Granted from what others have said on this forum about stuff not working from the factory blows my...
It's an led light module so it's not going to be a quick bulb change. If you are not a mechanic I would recommend taking it to the dealer. I saw a video on you tube on how to remove it.