Yes, there will be drilling to install this CURT Trailer Hitch Receiver with Drawbar # C11244. You will need to drill three holes into the rear panel of your 2001 Mitsubishi Diamente. I attached installation instructions for you to check out that detail this process.
If you plan on doing some towing you may be interested in the following products to complete your setup:
Upgraded Circuit Protected Taillight Converter # 119178KIT (installation video attached)
Hitch Ball 1-7/8 inch # A-82
Hitch... view full answer...