Seen this on fleaBay, they quote a +40hp on a Zed for £24.95 now that's cheap tuning..
http://www.ebay.co.uk/itm/Performance-Chip-Tuning-NISSAN-SKYLINE-350Z-NAVARA-PATROL-X-TRAIL-TIIDA-NOTE-/251320858169?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a83e3f639