Engine makes a loud muffled noise when pressing on...

back where i come from we call that acceleration....

Actually if you turn the ignition of first and then push the pedal down it shouldnt be loud anymore.....

One of three things 1) Fix the whole in the exhaust 2) Remove the "fart cannon" muffler 3) Buy REAL '70's American Muscle so your neighbors will complain about the loud MUFFLER noise.

is it right after youve started the engine?? if do this is due to the radiator fan kicking on right at start up..the air disturbance from the fan going at high rpms usually makes the engine sound muffled. of not then maybe you have an exhaust problem.

buy an american car and none of that will b a problem.

^^^ American cars are junk.

American cars are junk???

I've seen more cavaliers than civics with over 250k and the Toyota corollas and Camry's that Toyota built their reputation for reliability on were built in a GM plant in Anaheim California along side Geo's

Nah m8 American cars aren't junk they just tend to be cheaper models.

Fit= $14k
Aveo= $11k

LMAO besides nowadays all the manufactures have assembly plants in America and suppliers out of country, with multi-national design teams.

The difference is the 3k, and you get what you pay for.  
You goto an upper end American (ie Cadillacs) and there really isn't much in their model range that can compete with reliability AND price.

Lastly on this topic if you read the posters other topic he says it sounds like a broken muffler so he most likely has an exhaust hole somewhere. (Or a 'fart can' exhaust tip as someone else commented)

of course it's very hard to tell what you mean since we can't hear the sound, but it sounds like it could possibly be a blocked catylytic converter. does the engine get hot while driving as well? if so i'll bet you have a blocked or partially blocked exhaust system.