What is the quietest bullet style muffler? Limit 18 inches long. 4.5 inches in girth. 3 inch diameter pipes. Moroso? Flowmaster? Dynomax? Something else? Are these generally slip on fit?

 

spiral flows are very quiet. I believe flowmaster makes a "hushpower" muffler thats supposed to be really quiet as well, although pricey

the spiral flows (at least mine) had one end that was kind of stretched to fit over the pipe.

 

I run Magnaflows on my car but the ones I use are not street legal. It quiets the exhaust down enough that when I fire it up now, I don't need ear plugs now when it's running in the garage.