if your new pcm has the sticker with the code on it, you can use that to get the new tunes. your tunes with your old code wont work. if you dont have the sticker, you can pull the code off the computer by plugging in the tuner, hit system info if i recall and follow the promps. the code on the sticker has 4 digits, and the code off the tuner has 7, which is a little better since you have a tuner

the tricky part is the tuner has your old stock tune locked on it. so if you werent able to return it to stock before you changed the computer you might have a issue. if you have the tuner registered with sct, they might help you on on that issue. BTW, welcome to the forums
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goina hundred in a 55, and i dont know why..
some things were just meant to be..
05 V6 auto, torch red, basic,:cool: a few mods
06 V6 stick, vista, premium (g/f`s car)