well to answer you original question, i would need to ask questions, number one; wheres does the noise seem to be coming from? number two; is it directly related to how much the throttle? answer, possibly from it being a front wheel drive car and it being the axel, if it is just speed related then it probly is something that is loose.
more likely to be tappet noise
first check oil level in engine
if oil level is coreect have a mechanic adjust tappets, and tune engie
if you are using lower rated octane fuel than engine is tuned for this will also give tappet noise in engine
A loud knocking noise in the motor of a car at high speeds is most likely the engine. There could be another issue with the transmission if the knocking only happens at high speeds.
loose exhaust
As a guess ... your lifters are "loose", need more oil, Miracle Oil, or just a cleaning.
Lack of oil lubrication to the valve lifters.
Clutch throw out bearing bad.
Serious engine knock or valve train noise. Have this looked into by a pro.
You can use a car noise database to compare noises at mycarmakesnoise.com
Vroom Vroom
In most cases, you can tell that your lifters are bad, in your car engine, by the ticking noise. A bad lifter will make a tapping sound.
islam.
Check under your car... you may have lost a muffler.
it does this because it just does