racently i was having strange voices coming inside my exhaust and my usuall service was usually charging me a lot so i went to this moroccon guys this time with a advise of friend
he said my katalizator got broken without see
solution option 1 was to change that part of exaust to change that was sound expensive
solution option 2 which we went for he cut that part of exaust take of the catalizator and re connect the exaust with burning them into together and he said my car earn some more horse power now and no more strange voice he charged me 90 euro for this operation. sounds like fair deal ?