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Hahn Racecraft makes a turbo for the neon and the SRT-4 turbo will bolt up to the DOHC head. spudsterier did the SRT-4 turbo setup not to long ago.
N/A can be up to about 200-250HP depending on how radical you want to get with modding. Turbo's can get upwards for 300-400HP. One of the craziest neons I have seen is a 2.4 engine swap that put out over 600 wheel HP. Here is the video on youtube...