From time to time my car seems to be "off the money" I mean some times feels a little flat and not as eager as it does at other times. Some days i remember why i have the car when it makes me smile , Other times it could easy be standard power, Among things ive been told to try is the N249 bypass. Check the condition of my Forge DV ( piston and seat) Vac hoses? And a small boost leak? The car still makes 22psi and the AFR doesnt change when the car is on it or off. So if the Bypass is as straight forward as i keep being told i will try it... Does anybody have any tips as to whats diffrent from the other engine codes??