questions from a new owner: noises and more

sronis

Hello,

Got my 2010 370Z a few weeks ago and already did 4000 KMs.

Got a few questions (couldn't find in the search, but i'd be happy if you point me to the right direction):

1. engine makes a strenuous sound above ~5000. it's sounds like it's putting out a big effort suddenly. Hard for me to explain...
2. I hear ticks from the back side (specifically right side) every time i touch the gas pedal (or when i let it go) in low speeds and low RPM.
3. when idling after a drive, even not a high RPM drive, i hear lots of ticks form the catalytic converter (at least i think it's coming from there).
4. also, when taking a hard turn while NOT touching the gas, car sometimes makes a small jump forward, as if i touched the gas for a split second.
5. unrelated: when filling gas, tank is full but meter on the dashboard shows one bar less than maximum.

are these normal?

Thanks

Roni