There were theories during the late 80's that GM was hamstringing the Fiero development to prevent cannibalizing Corvette sales. They could have given them a turbo Quad-4 and the 3800SC for the ‘90 Fiero but it didn’t end up happening and instead the model was cancelled. If you consider that it would have been going up against the C4 ‘vette and looked like this, it’s not that far from believable: