[MidniteBlues]

Well if you think about it, you are making an unauthorized modification to the heart of the system, the engines running parameters from the creators. Re-programming or installing a 2nd ECM module, when you swap out an ECM, then suppose you have a catastrophic failure (ie: engine blows up). Lets say for what the 'reprogrammed' ECM did &/or was responsible for this failure, then you take the car in for warranty repairs with the original unit IS a form of fraud.. Warranty can, and will be refused IF they determined that the programming has been tampered with and/or if they have wised up and put blocking or a firewall protocol on the original OEM module or have integrated a area in memory on the said module where it cannot be modified and/or changed & has the original VIN hard burnt into it..AND made hacker proof....which BTW, is not that hard to do.. Its a chance modders take when they "modify" their cars. Some, then try to perpetrate a fraud on the car makers for 'free' repairs after they damaged their engines.. Those that think that these units cannot detect tampering I believe are in fantasy land.. I would bet they can tell it has been either tampered, and/or modified.. Thats why I have not done anything, many don't care and throw the warranty out the window, and will pay the price. I will not mod anything until at least the original 3yr/36k has at least lapsed, and would take my chances on the rest of it to 100K miles..or 5 years.. Thats if I even keep the car. Most trade ins want the car 100% original OEM, otherwise you might NOT get what its worth, esp if it imperils any remaining warranty period..