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You should use the Bosch coils as Bosch is the only manufacturer for n63tu engine. For the first version of n63 Delphi is manufacturer. Besides if you run the part numbers listed on Fcp web site in Delphi coil description non of those numbers is compatible with n63tu. I had a misfire and did some research, so bought Bosch coils and Bosch pugs from fcp and the misfire gone. So my suggestion to try Bosch coils
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