sounds like it is need of a tune up.
accelerating
Replace the plug wires
If the car is have issues accelerating it may be running to lean. Ensure the engine is using the proper air to fuel mixture so the car will not run lean.
This car is equipped with a Supercharger. All superchargers whine. This is normal and is inherently something you live with when you drive a car equipped with a supercharger.
Type your answer here... Your Mass Air FLow sensor might need to be replaced, its going bad.
800-1200 rpm
maybe a stick
The rpm of the engine - revolutions per minute
One clunk when accelerating (but now repeated clunks) and another when braking can be caused by broken motor mounts.
Your car if its a stick is not pulling out of gear all the way and your moter overrevs
Normally you have to listen to the RPM rate to know when to change into ANY gear on a stick-shift/manual transmission car. Changing between fourth and fifth gear isn't any different from changing between, say, 3rd and 4th. I wouldn't bother keeping too much of an eye on the RPM meter, because if you listen closely the engine will tell you when it is necessary to change the gear.