Then you can try something which HHOElectronics has posted in this thread...
http://www.ebay.com/itm/WIDEBAND-EFI...item3cb96227cb
I am thinking of buying this one to take care of both EFIEs and MAP/ MAF. I am almost certain that its very hard to get the performance chip work with the port which is supposed to read information and just erase DTCs....
I am seeing some improvements in my car after taking out mileage chip... previously I was getting 10KMs/ Liter, now I am getting 13/L. I hope by putting in EFIE and MAP/ MAF enhancers it will further improve. Another reason of buying this unit is it being generic, if I need to change my car, I can reuse it, instead of going through the same painful steps having mileage chip reprogrammed and test...