When ever my car has gone to velos to have the unichip mapped they've been unable to make any real increase to the engine below 2.5k(or was it 3krpm?) because whenever they adjusted the fuelling the lamdba cut it back.
On the WP website under VMAX chips it says this:
By altering timing and ignition we are able to gain significant improvements to the standard setup of the C20XE engine. Although brake horse power is only increased by around 10BHP special attention was payed to developing the low and mid range torque making the all round drivability more responsive with more power.
Hows that work then? Surely that chip wont do anything my unichip hasnt?