California emissions. Federal emissions. Express, savana. All models. Hummer H2. Seville. SSR. 3.8L. 4.3L. 3.5L. Manual trans. 4.8l, 5.3l, 6.0l. 4.8, 5.3, 6.0 & 8.1L, 4.8, 5.3, 6.0 & 8.1L.