i noticed some online retailers selling the two bros exhaust have an x-metal carbon fibre canister as well as the regular carbon fibre. what is the difference? two bros website mentions nothing of this x-metal version.

 

its carbon but it looks like big x weeves in the carbon unlike the tight woven regular carbon fiber were all use to seeing. i dont recall it ever being refered to as "metal" though. mabey two bros has metal in their carbon cans. but really i couldnt tell you on the metal thing.