I am currently in the process of mapping my own car and am stuck at the Lower Lambda Higher Lambda Maps.
Should I reduce or increase the maps?
I am aiming for 200bhp.
Any help much appriciated.

Lower Lambda = more fuel, more power, more smoke and bigger fuel consumption

Higher Lambda = less fuel, less power, less smoke and better fuel consumption

Thanks for the reply, So I am looking for more power so I would lower both maps?

Yes.