Well TBH I don't know what the actual difference is, I guess we need someone to check what the two part numbers are to see what the difference is? If the part number is the same for both ABS and NON-ABS models then there obviously is no difference! Everywhere I went when researching "ABS delete" it said you need a prop valve from a Non-ABS car, so I just went with it (surely all these people can't be wrong.... Or can they?). I ended up buying a shell that had no ABS from the factory so I sold the prop valve I got from Ricky before I got my new shell. But I guess there is a possibility it could all well be just a hoax and there in fact is no difference!