Hey! Sorry for the delay - I don’t have the mustang anymore unfortunately so I don’t monitor this forum much.
Regarding this issue - I reached out to Injen and they sent me a replacement part. Installed the new part and the car ran great. Definitely recommend reaching out, their customer...
When I first picked up my Mustang it had tint on the back and quarters. Here is a picture right after I bought it, you can get a pretty good idea of how it would look. I have since tinted the front windows.
Update
After reading through everyone's thoughts, I took the Injen off and went step by step with the install checking for issues. Discovered that the mounting spot for the filter is warped and therefore not sealing correctly. Contacting Injen and/or Stage3 Motorsport (where it was purchased)...
Car seems to be driving better today after cleaning the MAF and re-seating the sensor. The vacuum is still reading about 16.6-16.9 and the AFR is at 13.9-14.1. I'll continue to monitor the performance as the car learns the new intake. The revs only really hung up once during the drive.
The Injen is a no tune intake. There is a part you can cut off which makes it necessary but mine is intact. The MAF is seated normally on the intake tube
Thank you everyone for the help so far. I checked the MAF today and cleaned it, also checked again for leaks with a second set of eyes/ears. Revs seem a little better afterwards but still hangs up a bit. I'm probably going to drive it for a few more days and see if it shapes up. Otherwise I will...