I had a single hooker muffler for a week (good tone, low volume), just changed it to a flowmaster muffler (good tone, low volume). I come from an ls1 f-body background so when my vehicle has a v8 I want to hear the thing, even at idle. Every exhuast I've looked at has doesn't seem to be too loud. I'm about to buy some hi flo cats or some electric cutouts. I just want that great muscle car sound on my truck. What keeps my exhuast so freakin quiet?