I'm selling my car, so don't have need for the below items:
PLX Kiwi Wifi + iMFD: $150
($200 at http://www.plxkiwi.com/kiwiwifi/hardware.html)
I've used the Kiwi Wifi to datalog and clear/diagnose check engine lights on other cars. I have not used the iMFD functionality, since that is generally used with the below item.
PLX Air-Fuel Ratio Sensor Module w/ Bosch Wideband O2 Sensor (new): $150
($210 at http://www.plxdevices.com/wideband.html)
or buy the complete set of PLX for $275 ($410 from PLX)
all prices include shipping (to continental U.S.) and paypal fees
Don't let a tune and/or modifications cost you your engine; wouldn't you like to know how they're affecting your car?