Perfect fit for my 2010 Silverado 1500 , this muffler replaced the factory one. I wanted to hear the V8 in my truck, and I didn't want to go with a chambered muffler that would be loud at all times, WOT or not, inside/outside the cabin, at idle, on startups, etc, etc.I wanted something that will sound aggressive, but be civilized enough when you're just cruising down the street/highway etc. This is a bullet type muffler that will deliver the experience I wanted. This Magnaflow muffler not only uncovered the V8 tone I wanted, it's civilized enough to drive the truck around without being obnoxious with normal throttle input, and loud/aggressive enough when needed. I didn't remove the factory resonator, just the factory muffler, then replace with the 14619, no drone that I can hear, and I can keep a conversation with passengers inside without having to raise my voice over the exhaust noise inside the cabin.