It's my understanding that the '04s breath better. The intake (probably air box) is supposed to be more efficient and the supercharger, being the next generation, flows better as well. There may even be improved exhaust piping as well.
Marc
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'00 Trans Am WS6 w/ 25K miles - Lovin' it!!
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RIP '99 GTP w/ 41K miles - Totaled in fire
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RIP '97 GTP w/ 192K miles - Totaled when broadsided
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