What MAF?

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Most people believe the Pro-m is the best and most accurate. I have the C&L 73mm and I have had no problems at all. the pro-m needs to be sent back for re-calibration if you decide to upgrade injectors..... With the C&L you simply need to replace tube sizes.

regardless of which you chose, both work by 'tricking' the computer. the pro-m just seems, by most, to be more accurate.

before anyone posts back wanting to start an argument about how their pro-m works, search through some of the earlier posts. theres also a good site on the web which explains exactly how each works.

actually, read this http://www.mustangworks.com/articles/electronics/InductionBlues.html