I have a 01 cobra with m-80 muflers on it.it sounds good ,but inside the car it is loud. looking for some in put on different muflers.cherry bomb vortex sounds good,i listned to borla on the computer, they say that these muflers do not have drone.i would like to keep the agressive sound but get rid of the drone while crusing. maybe someone could come up with some good sound clips,thanks in advance.