Well my car is backfiring and lagging/studdering and its either cause by my bad o2 sensor, or i have an exhaust leak somewhere. When the cars running, it seems to me like i hear more sound near the front of the car than i do the back tail pipes. Its kinda hard for me to find exactly where it is, especially when my intake is sucking in air and make that loud as hell hissing sound. Is there any easy way to find the leak if there is one?