posted
of course, it is also appropriate to have some sort of technical explanation for the fins. my suggestion would be to use the same sort of explanation for the original piping on the dorsal sides of the TOS nacelles, which if memory serves is something about intercooler doodads in the non-canon.
Perhaps the powerplant for these nacelles runs them hotter, but then the TMP era nacelles can take it. Maybe there was no reactor upgrading, however, which is why Captain Picard asserted that the Stargazer was underpowered many years later, especially when the extra tech of many more years is factored in, too.
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