Hi all, I recently purchased a used 2016 Mustang GT 5.0 last night with 16k miles and one owner. When I was looking at the car I saw that the exhaust was not stock (Borla Cat-back) and so I checked under the hood and saw a JLT CAI. Not thinking anything of it, I proceeded on a 20 minute test drive and everything seemed to be normal. I went ahead and purchased the car, and drove home about 35 miles away without any issues. After looking up the JLT CAI in my mustang (JLT-CK1517-18) I noticed that JLT does not make any CAI's that do NOT require a tune, which they sell. Now, since this car is used, and I wasn't able to find any tuner in the vehicle, I am a little nervous about driving it since I have no idea if the previous owner tuned it or not. I understand that not tuning it with a CAI like this one can cause the engine to run very lean and cause serious damage. I'm a little apprehensive to drive it any further to say the least. My question to you all is, do you know of any sure fire way to see if it has been tuned? Should I just be safe and pop the stock intake back in or would that also cause problems if it was tuned?