Im going to say this simpy. If you dont have a MAFT do not vent. If you plan on getting a MAFT just so you can vent...you are not ready for a MAFT.
Edit: The GM MAFT is a BLOW-THRU setup, they are one in the same. The MAFT is the sensor/translator. The Blow-Thru is the kind of piping it uses.
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