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What is the diameter of the stock MAF sample tube? Isn't it 2.5"? I just built a SRI with Spectre parts using the MAF adaptor #9405 and other people on the forums say to use the smallest calibration tube. The smallest tube though is only 2.25" diameter, effectively reducing what the MAF sensor sees and causing it to run wrong, right? I'll pop the 2.5" calibration tube in in the morning and see if it changes the AFR. With the 2.25 it goes pig rich (torque won't show richer than 10:1 and that's what it shows).
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