I just installed a K&N filter into the ute and a think there's a slight more roar in the high revs but definately increased flutter noise. Could never really hear it before but can now. As for more performance, too early to tell. If anything, a slight increase in acceleration but I'm only going by 'the seat of my pants' feel :-) Could anyone confirm the part number for the k&N xr6T. I just want to be 100% certain as the rubber frame wasn't a totally perfect fit. Was wondering if this is normal.