A replacement part for our FAST LSXrt intake manifoldsthis upper shell is an exact replacement for the one that came with your LSXrt manifold originally; Edelbrock products offer improved performance and aesthetics for a broad array of vehicles and engines. 'Proven performance' is the philosophy by which Edelbrock was founded and it continues to this day with the highest standards for performance and quality. Edelbrock core products are engineered manufactured and tested in the USA to ensure the best quality possible. This is further backed by some of the best warranties in the industry and a highly qualified technical support staff.; Big gains in rear-wheel HP yet retains factory fitments and underhood clearance requirements