Okay, my cats went about a month ago so i swapped them out with Magnaflow high flow cats. Unfortunately the direct fit were not so direct fit and i needed to weld thread from my old pipes onto the new ones for the downstream O2 sensor on the drivers side. Not a big deal. Sealed up the thread with a bolt that i got with the new cats and welded a seal. After i put the cats on i was getting a much deeper sound when i started up and drove but NOW i have a nasty rumble!! Whats weird is that it only happens when i turn the wheel. WTF?? Any ideas??