the short ram for the altima ka24de is a new stainless pipe from the throttle body to about 8 inch's over to the MAF and an adapter and filter, and the CAI is goin to be the piece to go with i put 1 off ebay on my civic and i couldnt really here it in the car as good because the filter is on the pass side in the bumper, but added a few horses and the people outside the car can really here it. so the CAI in my opinion is the way to go.