Just looking at the specs and relative power gains from other upgrades I'm inclined to agree that there isn't much there. However if you have another line on the matter I'd like to hear about it.
1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo Warning: Objects in mirror aren't as fast as they thought they were.