Measure the diameter of the tube where your MAF sensor mounts, compare to the stock MAF tube. I bet the new CAI is larger, giving the DME a false signal, causing your engine to run way too lean & backfire. 
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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