Are you running a crossover up front? (an H-pipe or an X-pipe)? If not, that will help. Do you have room in front of the mufflers for some resonators?
what is the smallest out side diameter resonator for 2 1/2" pipe? These are so low there's scrapage from high centering on speed bumps and driveways.
I'm already running an X-pipe and there really isn't any room in the front for a resonator. That was the first thing I mentioned to the muffler guy when I brought the car in.The exhaust is too close to the body and transmission. Heck, I'm even rubbing in a couple of spots. Anyway, the diameter of the smallest resonators that I could find was 4" as shown in my links above.
And I have high centered the car on a speed bump in my work parking lot before, but since then I've raised the car in the front about 1/4-1/2" and added stiffer springs.
