Clicking/Hissing Sound When Accerlating

[gcas301]

Been noticing a strange hissing/clicking sound when accelerating, but not during any other type of operation (idling, cruising, etc.) I can only really hear it on the drivers side close to the firewall, I'm taking it to a shop soon but just wanted to get an initial opinion or confirmation of my suspicions. I believe it to be an exhaust leak of some kind, hoping it's just a gasket but was wondering if anyone else has experienced this before?