I wouldn't trade my Hahn powered PT for a new GT. Couldn't afford it for one thing. A friend just installed the new Jackson Racing SC & is very satisfied with it. Not as much HP as a turbo but is much easier to instal. Hahn stage 1 has about the same HP (actually a bit more) but is not a job for the average backyard mechanic). The S1 Hahn installed is about the same $ as the JR kit in the box.
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