Exclusive louvered core creates a sweet ''Street Rod'' deep tone that is not overly aggressive. Stainless Works is the only manufacturer to build all of their mufflers with ALL stainless steel construction; the bodies, cores, and packing are stainless. On a scale of 1-10, 10 being the loudest, these mufflers are an 8. These mufflers are sized so that they can be reversed for an even more aggressive sound. They can be welded or clamped in place and are the best tube style mufflers available!