well....ill tell ya what i know and others can fill in the rest...
the air silencer (at least on my stang) is that big rubber piece attached to the air filter's housing and goes into the fenderwall...it can be easily removed...basically it restricts air flow...dont expect great power increase from removing it, but you may get a cool sound from it...and on cool nights you might feel a bit more lively...
to change out the throttle body on a stock/near stock car is useless...your money is better spent elsewhere...
and i believe the maf would be a useless upgrade on a stock/near stock car as well...
sorry i cant explain more though...
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