http://tinyurl.com/hok92 - or - http://www.customefis.com/rttuning.html by using a cheap Laptop , a ROMulator II, and an upgrade for your TunerCat > you can change the 'chip' information as you drive > forget 'burning' a new chip outside the ECM. Nice thing is it works BEST on pre GM 1996 ECM units ~~! Author claims it blows off ACCELs DFI unit hands-down. Worth a read & a bookmark! Brien. NEW YORK eagle registry #501 eagle kammback registry