I don't have DHP but I believe what you want to do is possible because you have the option to have 1) only chassis, 2) only drivetrain or, 3) both chassis and drivetrain effected by sport mode.
Hope that helps.
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2011 535i xDrive, Dark Graphite Metallic, Veneto Beige Dakota Leather, Technology Package, M Sport Package, Executive Package delivered Christmas Eve '10, Mods - quad tips, 20% tint, JB4.
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