This allows you to adjust the fuelling across the rev range every 500rpm to optimize A/F ratio's Just fit a wideband lambda sensor and adjust fuel readings I bought this from THE USA a while ago and cost me an arm and a leg in import and carriage fee's Now have decided to go for a megasquirt instead so surplus to my requirements Will come with the printed wiring and operation manuals too, but also available online as a pdf Here is a link to the NEO on the apexi site so you can read up about it. AFC Neo, Fuel Management If you can collect from Oxford i'll knock £20 off too. Too bloody good to you lot!