Never said they sucked. But they were definately not "fast," at least not in a straight line. Heavy car + low HP motor = not very fast. Especially since when you have scoops liek that it general implies a turbo, and generall turbo cars are pretty quick.
Suffered a similar problem the 240sx's did. Good chassis and suspension, but the stock motor was junk stock. Maybe not junk, but compared to what we could have got... Just disapointing.