I found a hypertech chip in a pcm and some other one (jet?) in another. I was surprised at just how little was changed. I sold them on ebay after reading the chips. I still have the bins somewhere on my laptop. One was for a tbi 4.3 V6 in a 7427 pcm($0D), the other was for a 5.7 tpi in a 7730 ecm ($8D).