Put a wood baseball bat on your jack and jack it into the floor where you need space. This will give the down pipe enough room and leave the floor looking like it was factory indented.
You dont bassshh things Dylan lol…Bash the down pipe if anything.
+1 or use a length of pipe of the same diameter as your downpipe ( 3") and jack it up. Just make sure you secure the pipe to the jack or you could slip and damage something important.