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So this issue wasn't on my M6.. but on my GTR kept getting "air mass to low" CELs and I couldn't find a leak anywhere. (This was after beating on the car all summer).
Tuner suggested new fuel pumps and that actually fixed my issue (they were already aftermarket).
Not sure if there's a way to 'test' the HPFP's but worth asking someone who would know.
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