............AND..!!!!!!!........took my group A cone off and butchered an escort airbox............physicaly cant tell...a.c.t's aren't different,but the car is holding less boost.....which could mean the box is doing a better job??????...........anyway i like the high pitched chatter better,but i do miss the induction noise of a K n N cone..........next time i go to a R/R day i will take both.............