Two Brothers V.A.L.E. M2 Silver Series Slip-on Exhaust Systems for 2013-2015 Kawasaki Ninja 300All of Two Brothers carbon parts are made with a high temp aerospace grade epoxy resin. The carbon fabric is made with a 33 million modulus carbon tow then impregnated with the high temperature resin under very tight tolerances. This allows us to make sure that the fabric is impregnated with the exact resin content every time. We then place all of our products in an autoclave to cure. We cure all of our products under full vacuum and apply over a 100 psi for the cure. Using an autoclave allows us to consolidate the material and it also allows us to remove any volatiles from the material. This also includes any air that is trapped in the laminate.