Hi, I bought a 1990 SC about a year ago and the car needed Headgaskets and the overdrive was shot. I have fixed those problems and have slowly been putting this car back. The cats arent on this car and just a piece of pipe welded in place where they were. When I go to accelerate really hard the car sounds like a friggin duck. Its like a loud quack when you romp it! On the drivers side muffler you can hear something rattling around in it but I was wondering if it was because the cats arent on the system anymore or is it simply the mufflers themself? Thanks for your help.