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Actually compression is within 5%.
If it is an obd2 (post 95) an Elm 327 dongle can give you map and a bunch of other data on a Bluetooth device running " torque" free app.
There is no requirement for installed equipment except egr to work in CALI. it just has to be installed and look functional
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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