I've had this for a few months now, Love the deep tone. There is drone but its pretty light compared to what i had before. i daily this car. Tone got even deeper this recent month. Sounds amazing. comparable to stock but more nicer deeper tone and some loudness that wont bother your neighbors, sound will turn some heads for sure. wish I had some pops and crackles, they are there just barely coming out. If i were to switch to a highflow cat or no cat i know for sure they would. Great service too, They kept me informed the whole time. 10/10 would buy again.