kithemm

Hello I just installed this ark exhaust on my 2015 is350 fsport.
I have question for you guys.
1. the part of the H pipe is rest on the underbody brace.
1.1- is this normal?
1.2- do you need this brace?
1.3 - can you leave the brace out without reinstall it?
1.4- maybe this caused inside cabin vibration and annoying loud hummmmm sound inside the cabin from the trunk(rear)?
2. where can I get the brace to replace the OEM one? so the exhaust pipe doesn't rest on it?
3. does your make that annoying too loud sound (or drone) at around 1500-2000 rpm?
4. my car make louder hummmmm sound from the truck (rear) than it make from outside the car. is this normal?
5. inside cabin
- 0 to 50 mph keep it at 1500-2000 rpm making 89DB
- cursing at 50mph foot of the gas making 71DB
6. did you guys sound deadening your car?