TR4 Stainless Steel Carburetor Heat Shield. (Please note: This heat shield will not work with the TR4 Center Pull Throttle See our SHS-04A) This will improve performance as it indirectly increases horsepower by deflecting manifold heat away from the fuel bowls. As with all ARE heat shields, they are process engineered and manufactured on production tooling. Just add two new gaskets, and replace with existing hardware.