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Message: [QUOTE="cleatus12r, post: 1373329, member: 18093"] I still don't associate changing the PCM with the word "upgrade" but then again very few things that get changed out for no reason are called "upgrades" even though they do nothing in the way of increasing reliability, efficiency, or power. I do understand your reason for wanting to change the PCM in your case but keep in mind that the e99 PCMs need different formulas for aftermarket scan tool support. You'll also need to get different tuning after the PCM change. To answer your other question though, yes, a comparable transmission/emissions 2003 PCM WILL work fine other than the water in fuel light will be on all the time. [/QUOTE]

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