yea after I reset the ecu I felt a difference on accel, sound is defintly different. at about 3000rmp the engine has a very deep sound much better then the stock sound, and after abour 3500rpm you hear a whistle from the filter because its sucking so much air. also the thing I noticed was that after I installed it I turned the car on and put my hand in front of the filter and I felt air getting sucked in which is a big difference to the stock intake. Also, if you put a plastic bag on the new filter and rev it sucks it in compared to the stock one which could bairly keep it in the engine bay, it kept flying away.
So yes positive sound change, positive proformence change.