I had this diffuser on a 2016 corvette stringray with z51 package. There is no drilling required to install this. It has 2 brackets that need to be installed one by the exhaust and one by the parking brake cable. You need to take the 2 exhaust bolts out in between the mufflers and one of the mounts is mounted there. The other is where the parking brake cable is attached with 2 bolts. It isn’t a hard job to do. The actual diffuser mounts to those 2 hanging mounts and bolted to the bottom of the rear bumper with 3 screws on each side. I had it on for 2 years then sold my car. It didn’t damage my bumper at all being on there. If you have any questions please feel free to ask. I would rather this be a local pickup only cause it is bulky and I wouldn’t want to have it get damaged getting shipped.