I've had no problem with panel filters either, as already mentioned above make sure there is no excess oil, Jabba bake theres to dry out some of the oil, and as for increases in power, Jetex on Focus 1.8 TDCi 125bhp, with remap 146bhp, remap + Viper induction kit 145bhp. Standard the Focus was 113 although I have not power runs without the panel filter.