I put on the typhoon intake and saw no drop in mileage, if anything I got better mileage. You might pull the MAFS back out and make sure you did not get fingerprints or dirt on them. Also make sure you got your clamps on good and you don't have an air leak. Maybe also check your rubber EGR tubes that were a bitch to put on are not kinked and blocked, especially the driver side one.
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