Even with the stock mufflers you wont past 92..
You have to look for 95 DB days which are out there and then of course 105.
I pass 95DB days using laguna pipes and these inserts.
https://www.summitracing.com/parts/cci-3di25r
Obviously get the right insert for your size of LS pipe. I've had them tack welded inside the pipes and they cancel out the sound.
They work great and I've had no issues but id give up on the pipe dream of making 92DB days.