chief if you get a full refund i have a suggestion for you.. i removed my resonator and secondary cats and in place of the h pipe i installed a magnaflow x pipe. total cost was approx 200$ for everything. now i have a mellow sound around my neighborhood and a euro beast when im in the throttle. virtually no drone at all which i attribute to the x pipe. without using the needswings dual exhaust imo this is the best sound for the s/c engine. the amg muffler is really a great muffler