Jig saw with a fine blade. Tape off all of the area that the saw gate will contact with the fenders, the vibration will rub marks on the textured plastic. I double taped, two layers, and still had some ares where the saw gate rubbed through. Use a sheet rock rasp to smooth the cuts and a sanding block with medium to fine sand paper. There are a number of examples and threads on here, good luck, they'll turn out great if you take your time! :thumb: