usally alls an ecu mod does is increase the fuel flow and the rpm limit, u cant even do that with these ecus. If u increase the fuel without increases in air then your just screwing up the mixture, the ecu can only advance the timing so far and let so much air in to compinsate. The stock air intake is tuned for the power output so again changing the fuel delivery screws up the tunned intake so any gain the mod did is adversly affecting other parts of the equation. 3-4HP is not noticable and I don't know many people that are irresponsable enouf to redline their vehical everywhere they go since this is the only part of the power curve affected Bottom line. Its a sham. There charging what 30 bucks for a couple 10cent resistors I think u even have to go get them.
