Hi everyone, i installed this cat-back some 3 weeks ago. started off sounding awesome. deep throaty sound a very loud scream when you floor it. had some drone at about 2800-2900 rpms but nothing that bothered me. here is my issue: it sounded great until about a few days ago. sound all of a sudden changed from deep and throaty, to thin and raspy on higher RPMS. nothing changed on the car in the meantime. i know all these exhausts need a bit of time to break in, but to loose the sound like this? do i just have a pair of bad mufflers or what is going on? its just not loud any more. and yeah, since it isnt, drone is gone now, which i rather have it being loud than like this. anyone had a similar experience?