Exhaust cut-outs in bumpers?

[GMAN]

what did you use? just a jigsaw? and did you put any fiberglass up under it to or did u just use the exhaust to hide it?

It was some type of heavy duty jig saw. I plugged into the air at my shop. I trace the oval shape as best I coud with a sharpie and then went to cutting. I didn't use any fiberglase. I like the way they came out.