the Hill power kit sounds excellent, but ive ditched it in favour of a airbox wih 2 decent sized cold air feeds works alot better, sounds ok.
I cut a circle out the top of the airbox ( the bit facing the bonnet) and bought some flexible plastic ducting, ran one pipe into the hole and down through the hole below the headlight(its covered by a plastic cover) and another to replace the sh*te standard pipe underneath.