Not a great deal cos Stu can do much more with the L8 now the P8 is a quicker ecu just like a computer but i've been told its prone to failure

only advantages is newer,quicker,cheaper for coilpack conversion

Disadvantages,Prone to failure no adjustment for co so u need to run lambda,chips are more expensive

other than that i see no ral difference that u would notice driving your car

Paul