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The construction makes this Upper Shell far superior to aluminum versions. Construction and Appearance. This Fast Lsxr 102mm Intake Manifold Upper Shell is engineered from an advanced polymer material. This polymer is more lightweight stronger and improves heat dissipating better than aluminum models. The modular design means quicker and simpler disassembly. The black color looks amazing. Installation. Putting this in your truck is relatively easy. Application. This Fast Lsxr 102mm Intake Manifold Upper Shell fits 2010-2013 4.8L Sierra 1500s; 1999-2013 5.3L Sierra 1500s; 2009-2013 6.0L Sierra 1500s.