Thanks fatboy. I have fitted the sensors but am currently connecting those c*%ting springs on the headers. I'll see what happens when i fire it up. If i do get errors then i will remove the lambda sensors.
Whenever I've fitted a full system I've always replaced the exhaust gaskets to avoid exhaust gas leakage. Exhaust gaskets are generally only designed for one use as they are crushed when the headers are torqued creating a seal.