I just bought an 04' X here in PA and have since moved to Colorado. Have noticed a severe drop in performance when I get up in elevation.( hard to get to 60 MPH) I have the 6 cyl w/ manuel tranny 4x4. I would like to upgrade to a K&N FIPK and an after market exhaust. Will these help me or do I need to look at getting my computer "reworked" for the higher elevations. Thanks in advance.