no, not covered under extended maintenance.
extended maintenance covers scheduled maintenance such as oil changes, filters, fluids, inspections, etc.
doubt it would be covered under extended warranty as well since its a wear/tear item.
Read the fine print on what is covered and what is not.
'06 BMW E46 ///
: '08 BMW E60 DINAN ///
M5, Interlagos Blue, SMG
DINAN Stage 2 Suspension, Exhaust, Stage III Software, Front strut braces,
Intakes, 13% Underdrive pulley, 3.91 Differential, RPI Scoops.