There is a loud exhaust noise coming from front end of exhaust system- on 2005 Hyundai Elantra

Sounds like its coming from engine compartment.Car runs fine,just noisy.No noise coming from muffler,only front end of exhaust.Any ideas? Cost estimate?Only slightly noisy when idling

Asked by for the 2005 Hyundai Elantra
could be cracked manifold or a bad front exhaust seal