Can someone please tell me what the hell the noise is coming out of the exhaust? I've taken this to the shop 3 times now and each time am told it has been fixed but never is. Noise starts after driving for 15-20 min. Please see youtube video bwlow.
https://www.youtube.com/watch?v=H17XKViz7CY&feature=youtube_gdata_player
https://www.youtube.com/watch?v=H17XKViz7CY&feature=youtube_gdata_player