High Velocity Exhaust Jackets TT11246High Velocity Exhaust Jackets4 6 Cylinder Kit TT11246 11246 The Quick Wrap High Velocity Exhaust Jacket is an innovative way to insulate and block radiant heat, using Thermal Conductive Technology. The jacket covers the tubes vertically allowing for a consistent fit. This allows the exhaust system to expand without restriction as it comes up to operating temperature and provides air space for added insulation. High Velocity Exhaust Jackets can be