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What exactly does the universal mean in the universal 75 mm Pro-M MAf. The 80 mm that pro-m sells isn't called universal. why is this??
 

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I think they use the term "Universal" because the meter can be used with any inlet system. Other systems that use a single sample tube can be affected by the way the air flows into the meter. For example, C&L or Pro-M "bullet" meters can perform like crap if installed right after an inlet elbow. The elbow causes all the air flow ot be concentrated on one side, missing the sample tube and causing the system to run lean (or sometimes the other way around, and causing a rich condition).
 
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