This is for my '84 K5, with a 350 SBC and 2 1/2" suspension lift (see profile for more details) Right now, I'm running old, nasty headers into 2 turbo II mufflers, and out the sides. This is true dual setup, with no cats. I would like to replace the headers, put in a Y pipe, run a single high flow cat, then a 3" pipe back to a flowmaster with dual tips. The sound I am looking for, is one that is throaty when the gas is hammered, but fairly quiet when idling, or just cruising around town. I checked out the 40's, 50's, 70's, etc .... but I can't determine which of these will have a 3" inlet, and dual outlets; and also, which ones will give me the sound I am looking for. Any help/opinions/advice is greatly appreciated! Thomas.