How can I slightly mod a 2.5L Pontiac Fiero?

[josh]

I don't want to do an engine swap or do anything dumb like trying to turbo it, I just want to know what slight modifications can be done to the engine without pushing the limits of the block.

 

[Dixton]

air filter,
high flow exhaust.

 

[cypherbane139]

electric turbo ;D