Kidd,
I have the HD parts and accessories catalogues for the past 5 years. They don't actually list a Stage 2 kit for 88 cu in. They list a 95 cu in and 103 cu in Stage 2. In addition to Stage 1 equipment, there are new jugs and pistons for the displacement increase and new cams.
So, I would surmise that the Stage 2 kit is basically a Stage 1 kit with performance cams added. And, of course, there would be a different map (re-calibration) for the Stage 2 setup.
Hope that helps.
