Not Felix Domesticus. A BBK 2.5" Catalytic convertor x pipe. I have an off road x pipe with super turbo mufflers and a low RPM drone that is louder than a Siamese with its tail stepped on. It actually seems quieter under a heavy foot than at cruise. Will the new cats help kill the drone and how much will it quiet it down overall? PS The new seat covers turned out great, I will get pics. But the new driver's seat foam is taller than the piled up stuff they had under the driver's hind end before. Would a couple of bags of water softener salt on a towel in the driver's seat when I park it be a good way to get back some head room?