this rules out the fsi but its ace for newer cars. you need:
android phone:

App from android store:
"Torque" free ad version or £2.50 odd for no ads.
http://torque-bhp.com/software/torque-a ... -adapters/and finally an obd bluetooth sensor. anything from 15 to 200 quid. the 15 quid ones are reverse engineered chinese pirate jobbies. I got one. apparently its an ELM 237. but it isnt.
Something like this, can be found cheaper....
what can you do?
this app is cool,
you can read fault codes, clear fault codes, cancel the mil light, cancel service light, do 0-60 times, quarter mile times, check your bhp, torque, mpg, boost, coolant temp, use it as a eco tool as it monitors your driving, use it for gps. its super cool.
all wth customizable graphs, dials gauges based on cars weight, engine capacity and real time data from the ecu and engine sensors etc etc.
i have it on my dash and i jizz all over it. have a go.
youtube:
http://www.youtube.com/results?search_q ... =0&spell=1 