thats odd then you should get new mufflers..... check your cats or something ...just my 2 cents

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Black 2002 X5 4.4i w/ x-pipe, euro sport mufflers, umnitza euro headlights, hid fog lights, led reverse lights. led interior lighting, led license plate lights, de-badged, black grille, tinted tail lights, carbon fiber emblems, smoked out side markers.....more to come