Is the stock catalytic converter on the 1982 Corvette considered "high flow"? I want to put on a Flowmaster system to bump up the power and increase the volume. I want it to sound a little beefier but not obnoxiously loud, any suggestions as to which system? I would like it to fit like the stock system if at all possible. I'm kinda leaning toward the Super 40 or the 50 Delta flow. Any comments would be appreciated.