Mine has NGK and single tip Iridium plugs. A NGK coil set from Summit Racing goes for $140.99. #NGK-49177 After putting them in and running it, the range went above 500 miles! I think it maxed out at 525+ miles! So it did see a difference from old stock worn out coils. Three were original. Three were replacements. #3 was failing intermediately so I replaced them all.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)