i raced my friend with an rsx-s with i/rh/e when i was stock (4dr si) and he would pull 3 cars on me from about 40-80mph. when i put on my injen cai we did another 40 roll and i would pull half a car instantly then he would catch back up and slowly slowly pull on me. this is enough evidence for me to believe that injen really does add power
. i was very surprised and now hes a little scared of my car lol
