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OEM all day long.
One thing we ran into with the OEM coil packs on the Aston Martin we ran was overheating. It was so bad that we installed a new set EVERY race day.. about $4K. The Mercedes which used the same basic engine as the Aston never had an issue. The Gt3 spec Aston also had no issues. After much dinking around ( for a season), it was finally solved by improving the airflow over the top of the engine and some additional insulation ( the gold stuff).
You may want to go down that road as well.
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