The C&L uses the stock ford MAF sensor, it uses calibration tubes to "trick" the computer. The pro-M's are ussually recalibrated and should be more accurate, at least in theory. I have been using a C&L 76mm for a while and have had no problems with it. My car idles good and runs great.
Someone correct me if I am wrong, but I think the 73mm was discontiued.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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