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I have run 4 hole 0280 155 931's successfully on my previously reasonably stock 3.2.
Since you have modified the engine, I suggest at the minimum you do a dyno run to confirm the AFR's are safe. However, I suggest you go the next step and have Steve do a custom chip to make the most of the not inconsiderable money you have spent to date.
However, the next step really should be to toss the AFM and go aftermarket ECU.
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