Are you having any miss fires on acceleration? The reason I ask is most coils last 100K. The OE ones are fine. See Penske parts for the OE number Penske Parts - Technical Diagrams & Parts Catalog

#1 *12131712219 *IGNITION COIL - BOSCH*(to 06/09) QTY 8 * $62.84
#1 *12137594938 *IGNITION COIL - BOSCH*(from 06/09) QTY 8 * $62.84 12137594938 was superseded by 12137594937.
#1 *12137594937 *IGNITION COIL - BOSCH*(from 06/09) QTY 8 * $64.71
#2 *12131437986 *LOCKING MECHANISM QTY 8 * $1.17

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green