The classic I have now has a Hotshot header, high flow cat, and a Magnaflow catback on it. Do the Magnaflow catbacks come with a resinator already installed? I havent got under there and looked yet. But when driving at highway speeds, it sounds like there is one installed, because the car is pretty quiet inside. However, at around 4k rpm, I get this raspy tone coming from the muffler, almost like a loose baffle inside the muffler. I like the tone of the catback, but that noise is annoying me!