i am looking in to fitting one of these at the moment (stack)but what i dont understand is do i have to fit an extra boss in my exhaust or will this replace the lambda sensor i have.
the car is a small turbo escort, i have had problems with it being lean in the past without knowing so i have replaced air meter and having the pump and wiring checked but will and faulty lambda cause this,plus the car has its cat removed.cheers darren