hey Maok,
good to see yourself and the like of AwadKhan doing some good stuff out there.
Wideband - get yourseld an innovate from the states, works quite well but you might need to fit a Y piece adapter before instering into the exhaust tail pipes as the innovates overheat very quickly.
Street mapping is all and well but getting consistent load especially at low rpm vs high load is pretty much impossible unless you want to fry the brakes and it's still never that great.
What tool are you using to write to the ECU's via OBD? (Email me if you don't want to answer here).
Thanks
Salman