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They are one and the same. It will work fine as long as he has loaded the original oem tune back into his car. This is how they keep people from using it on more than one car. You may need to download the latest update from their website if he hasn't already done so. Cost? Nothing, the download updates are free from the diablosport.com website.
Are all the tunes free from diablo for my V6? I couldn't find any tunes for the V6 on the website, can someone help me find them? Also can you adjust the shift firmness without having a tuner shop do it for you? Will I see any gains without a CAI?