OK, thanks for answers so far

Next, choosing the best one of these two:

L8 ?
P8 ?

Which would be best for a live mapped 330 BHP engine on greens/T34 turbo, to be used for fast road/track days WITH NICE LOW (MOT passable) emisions????

And finaly, which would be best for a live mapped 500 BHP engine on 750 or 1000 CC (MSD) injectors/T4 turbo, to be used for fast road/track days WITH NICE LOW (MOT passable) emisions????

TIA........