So removing it will give me better sound but worst MPG?
Yep! It was there as a choke to control air flow. Fast cars have bad MPGs, while economy cars are the opposite. Let more air in, you're burning fuel faster (Need oxygen to fuel fire, same with combustion). The sound is similar to a CAI
, but not as deep. Better off getting a new Intake
and ripping the airbox out for more gains. 1-2 hp gains without the butterfly are
. It hasn't been dyno'd.