Lowrider customizations consist of sun visors, fender skirts, bug deflectors, and swamp coolers. Jet blast deflectors usually direct exhaust gases upward. Engine exhaust deflectors provide infrared thermal reduction reducing the threat of heat-seeking missiles. Heat deflectors and insulating gaskets attempt to minimize this effect. These were later replaced by deflectors with angled top. A special commemorative plate was affixed below the nameplate on the smoke deflectors. The electron-optical system also includes deflectors and stigmators, usually made of small electromagnets. "Sir Percivale" was fitted with large, square German-type smoke deflectors. Various styles of smoke deflectors have been used by different railway operators. Big One was also rebuilt, carrying smoke deflectors and a Streamlined-style front. Initially these too were built without smoke deflectors but later acquired them. Shortly afterwards, the German smoke deflectors were refitted. Two of four jet blast deflectors were enlarged to accommodate the Tomcat. Also surviving at the LC-34 site are the two flame deflectors and the blockhouse. All the locomotives had small "Witte" type smoke deflectors.