questions about timing/ knock Options

[recneps]

so yeah these may seem like dumb questions to some of you but remember i habe never ever been in any kind of auto tech class etc..

anyways does the 5s/all cars have a knock sensor. i know the 3sgte does.

also the ecu/ ignition advances your timing automatically right?

so if you have a knock sensor and your car advances your timing automatically it would advance your timing until the brink of knock right? kinda like a msd btm just for n/a cars right?
- so running 106 octane would let your timing be advanced even futher correct?

also my friends run 115 octane in there cars a lot and they say it add horse power and the only way i can see this is if there cars advance there timing even further.
- these cars are de-cated