Cometic Nissan 240SX LE 1991-1998 Lower End Gasket Kit. Individual gaskets and gasket kits are available for both the domestic and import automotive markets. The performance gasket line offers options in head gasket hole size and shape, gasket thickness, and custom water passages and pocket dimension solutions. Valve cover and MLS exhaust gaskets are also part of the performance gasket line. The StreetPro gasket line is a Cometic Gasket product line manufactured by Cometic. StreetPro is geared toward the street enthusiast looking to purchase a kit with all the gaskets and seals needed for a rebuild. StreetPro gasket kits are sold as upper end kits and lower end kits. Purchase upper and lower end kits for a complete engine rebuild. Quality gasket materials are a priority in StreetPro kits. Kit materials include MLS, AFM, aramid fiber, and Clad armor. Modern lightweight engines are producing more horsepower, higher cylinder pressure, clamp load, and operating at extreme temperatures. Cometic is committed to providing innovative, Good-qualitygaskets that maximize the power and performance of your engines. Cometic gaskets are proudly. using materials manufactured on American soil. Cometic Gasket, Inc., is an exclusive product of NASCAR Performance.