u/94x7

So, i daily a 8th gen r18 completely stock, and i just noticed that when coming to a stop like the car downshifting from 2nd to 1st , my car has this very quiet burble, but loud enough so u can kind of hear it if its just silence. I never noticed this before in my year of owning it, but i did knock the muffler off once going over a curb, but had it welded back on. Im not really sure if its actual burbles from the exhaust because the car is completely stock, i dont think thats pretty normal and thought it was pretty funny, but should i be worried lmao?