Fender flares
I only know one person who actually had a problem with that. Easy solution was to put a little gorilla glue between the this flare plastic and the ribbed thicker support plastic. He doesn't have any problems now. He also cut his really narrow. I havnt had any problems with mine flapping but I didn't cut much of the supports.
Definitely cut them! The first cut is the hardest, but if you take your time they will turn out fine. As others have said, I used a dremel to cut, kept the supports, and used door trim to clean up the edges. However, depending on the door trim you use, the adhesive may come loose after a while. I simply pulled the loose section and applied a gel super glue and reapplied.

I watched several videos on YouTube and read some write-ups on here. I took what I liked from different ones. I took the most from a lengthy video from a guy with a white JK, maybe JKU. Also, I cut mine with the fenders still on the vehicle. Essentially you use painter's tape to mark off the style you want and go to it with the dremel. Then, cut the support back on the front. The rears were VERY easy to do as there were no support structures to cut. Good luck!!
Definitely cut them! The first cut is the hardest, but if you take your time they will turn out fine. As others have said, I used a dremel to cut, kept the supports, and used door trim to clean up the edges. However, depending on the door trim you use, the adhesive may come loose after a while. I simply pulled the loose section and applied a gel super glue and reapplied.






