Just to clarify, the speed of the driveshaft rotation affects sound duration. (nothing else affects it)

On way home, found deserted road. did 100 to 10 hard on brakes in the 300C, 4 times. The brake thumping is nearly gone now.

98,6Bolt,3"EXH,LINKV3,780cc,SD,SCM61@26PSI, 340LPH,AFPR,TSBOV,REARWB,FMIC,2"RAD(20/80/WW)