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if you've brought it out to 3.8 and it is still making small power then it can't move enough air - exhaust or intake are restricting it. not sure what you re-sleeved, as i don' think you can take a 2.5 (which is what was around in 1999) out to 3.8? regardless, some chinese headers, drill and tap for an intake from a 996, and a tune, and you should make more power. perhaps not a lot as (noted above) jake from flat 6 says you get into diminishing returns with displacement increases on these engines. can't recall why; perhaps head design (combustion).
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