A few months ago, I purchased a Roush CAI for my 2016 V6 Mustang. Yes I purchased the one meant for the V6. It was supposed to be a no-tune intake. We all know that if you want to get the full power of an intake, it would require a tune, but I didn't want to void the warranty. I followed the instructions by Roush to install the intake, just to make sure I was doing it correctly. Even left the battery unplugged for atleast an hour. Everything lined up; fit perfectly. I noticed a change in performance alright. It was the exact opposite of what all the reviews I had read. The car just felt sluggish. It was slower on acceleration. I drove it for a couple hundred miles, just to see if the computer would compensate for the change. Did not change so I removed it and reinstalled the factory intake.

What could it possibly be that would make the car react this way? Please help. I would rather use the $300 I spent than to let it sit in the closet.

 

Have you figured what happend yet? Im thinking of doing the same on my mustang, but after reading about your problem im not.

 

I spoke with someone at Roush Performance. They said that running a higher octane fuel would eliminate the issue. They recommended 91, but I switched to 89 octane and haven't had an issue.

 

I have had the roush CAI for my v6 mustang and it works great. It help me take off 0.8 sec off my 0-60. You might want to try what mrcsinch said because i have noticed that about my car. When i use 89 the car feels a little lazy but when i use 91 the car feels more alive and you can definitely hear and feel the intake going to work.