What other mods did u have when the 181 went lean. I think im having the same issue up top. Mods are in my sig. I was leaning towards just getting the fuel pump but have been told it would not solve the problem. Theres a wideband on the way and im pretty sure as soon as its installed my wot joyrides will be over until i richen it up a bit. What afr was it before and after the pump?