Vibrant Performance Titanium mufflers and resonators are manufactured entirely from CP1 grade titanium for the utmost in strength, low weight and durability. Our “True Straight Through†perforated titanium core ensures unrestricted exhaust flow. They are available from muffler inlet diameters ranging from 2.5†to 3.5†and resonator inlet diameters ranging from 2.5†to 4â€.