Simpson Racing CarbonX® Ultimate™ Underwear firebird may require trimming for lightweight

may require trimming for lightweight LS engines

making it an ideal upgrade for track and auto cross applications

SAE 75W/80W/75W80

and seal life

Simpson Racing CarbonX® Ultimate™ Underwear firebird may require trimming for lightweightCarbonX Ultimate underwear is made from double jersey interlock knit comprised of a patented blend of high performance fibers and has extraordinary thermal protective properties. It is inherently flame resistant, will not burn, melt, or ignite when subjected to direct flame. Nomex or CarbonX Underwear underneath a racing suit will dramatically improve Thermal Protection Performance (TPP) in the case of an accident involving fire.