Ive just recently changed my intercooler to a rs500 one and replaced the radiator and fitted a new t34 turbo.

It used to run a 4x4 intercooler with a t34 turbo but have now got the bigger housing one

Ive been told I will have to get it re mapped and need to get a lambda sensor put in??

Any suggestions?

Forgot to say its had stage 3 and running dark greens

Thanks