I just bought dual cutouts and Im waiting for them to arrive. I was wondering where the best place to put it would be. I have a 2000 z28 and I was looking under the car (I dont have jacks) and it seemed like it would be hard to put them before the cat. I would like to have it before the cat though. Is this possible? Im running completely stock minus a k&n intake. Or should I just put it after the cat? Also, how long did it take for the shipping?