Over our side of the pond an FSE valve (Adjustable fuel pressure regulator) is a very common mod. It cures the flat spots caused by fitting free'r flowing air filters
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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!
