K&N normally is worth at max 2hp. It doesn't do much on it own (except add more induction roar), but its when comnined with other mods such as better manifolds and exhaust that it pays off

Mine dynoed at 0 HP increase on my Zetec when fitted

Mad Mole
Visit Mad Moles Mondeo Madness
2L Zetec, Cams, Stage 2 head, Valve work, Powerflow, Unichip, AEM Ram, K&N, Ecotek, 75mm Lower etc.
192 BHP, Faster than a speeding Duratec!