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Discussion Starter #1
Hey guys. I was wondering if anyone could help me. The 87-88 fox body cars were speed density correct. Were the California cars Mass Air? I just picked up and 88 and it has mass air. I was wondering if this was installed factory or aftermarket? The harness looks to good to not be factory. Thanks.
 

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1989 was the first year for the mass air mustangs with the exception of the california bound 1988s.
 

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Discussion Starter #5
Thanks guys.
 

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what do you guys meen by mass air?
it has a mass air meter, your car being a 91 has it, its the sensor before the throttle body but after the air filter, cars without it dont accept performance parts as well
 

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the other option would be speed density
 
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