Dinan has carefully lightened the stock dual-mass flywheel for faster acceleration and more immediate throttle response. The Dinan flywheel has been lightened for a substantial 23% reduction in rotational inertia. The improved performance does not come at the expense of the smooth engagement and quiet operation provided by the stock configuration.
Not applicable for production dates after 12/2008. Note: This is for the 535xi only as the labor time is more than the non-xi.