I was told that a cold air intake and a 1" helix throttle body spacer will increase Torq and HP as well as increase fuel milage. I put both on my I-6 JEEP and was supprised at the noticable difference it made. If I understand correctly... The colder denser air coupled with the swirl from the helix spacer gives better fuel atomization, which means a more efficient burn ='s more Tq & Hp and better milage. I got a very noticable increase in Tq, and around 3-4 mpg more from it. I did notice a slight increase in temp with it ... approx 2degrees according to my factory indicator.