In many people with tinnitus, the cause is not known. The ear is otherwise fine. What seems to happen is that signals are sent from the ear down the ear nerve to the hearing part of the brain. The brain interprets these signals as noise. It is not clear why these signals are sent from the ear.
Octane booster is  a product which is designed to rise the octane rating of the fuel. The main idea behind using boosters is to increase power and also vehicleâs efficiency in certain engines. These have anti knock additives which when added to fuel prevent the onset of knock (detonation or pre ignition).
Knocking in engine compartment: It's a myth that there are benefits from using a higher-octane gasoline in your vehicle than the owner's manual specifies; however, using a lower-grade fuel can very well produce engine knock. Follow the owner's manual requirements in all things oil, gasoline and tire air pressure. Loud bang: If the sound is as if someone put a cherry bomb in your tailpipe, it's a backfire. It could be the air-fuel mixture is too rich. It could also indicate that the catalytic converter isn't functioning properly. Low-pitch humming or whirring under car: This could have any number of causes.