I recently had an auto-x and I decided to lower my car down another inch front and rear.
After I lowered it down and the suspension got settled I realized I did not have enough clearance.
I didn't feel like raising it back up so I decided to roll the fenders.
The tools I used were one aluminum baseball bat, one cloth rag, one hacksaw, factory jack and one heat gun.
I started with the front. I jacked the car up just enough to fit the thick end of the baseball bat between the fender and tire. I then lowered the car down two cranks. Before I started to roll the baseball bat along the tire I heated up the area with a heat gun to prevent cracking paint. I also wrapped the end off the bat with a cloth. Then I rolled the bat along the tire and pushed the fender out. I kept lowering the car down and rolling the bat along the tire until the fender was pushed out enough to have clearance.
After the fender was rolled I needed to remove a portion of the plastic inner fender liner becaues it could no longer attach to the lip of the fender. That is what I used the hack saw for.
The back I did the same way, but it is not noticible because it just bent the indside of the fender flat. Feel back there and you will know what I a talking about.
Overall it took about two hours to do the whole thing. It was not difficult. It just takes some guts to take a baseball bat to your car
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Close up of the rolled front fender.
Picture further back of rolled fenders.