I know the age old discussion of which is better has raged since their conception, that is not what this thread is about. My question pertains to their abilities. Will either of them allow me to delete things from my ecm? For example will the programs allow me to just delete my rear o2 sensors rather than have to worry about sims? I understand that the programs let you change different aspects of your car such as shift points and governers, but how far do the go in costomization of the ecm? Anyone that has experience with these programmers chime in and let me know what you think and what they can do. Thanks alot.