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2002 S = 250hp VarioCam
2003 S = 258hp VarioCam+ & freer flowing exhaust & freer flowing side intake duct
2004 S Sp.Ed.=264hp 987 airbox,MAF tube & DME tweek & Sport exhaust bypass
2005 987 = 280hp DME tweek & greatly improved exhaust system
incremental weight gain each year
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