Jen and I installed a SuperSprint exhaust with new mounts and hardware on her car.
We also checked out the car for leaks, flex disk, missing/broken items etc.
To get the tips level you have to modify a bracket or spacer it down somehow on the passenger side rear mount. In this case we used a modified bracket.
When hot, the tips move down around 1/4 inch. Little if any side to side movement.
I usually space them down two or three tongue depressors from the bottom of the opening to the top of the tip. Each depressor is around .060 inch. I normally tape two or three together as a gauge, adjust and then check.
Today we taped the three depressors together and then taped them to the top of each tip. Pushed up the muffler and tightened. This step saved a lot of time. Sort of obvious, but the thought never came out until today.