Compatible with LS7 style Raised Rectangular Port Cylinder Heads.; The LSXHR™ 103mm Intake Manifold for LS3 Rectangular Port Applications is the industry's first polymer tunnel ram-style intake manifold and is ideal for generating maximum power in boosted and naturally aspirated engines. Standard "tall" stacks are interchangeable with separately purchased "medium" and "short" stacks to find the most powerful combination. Polymer construction is lightweight and high strength to eliminate power-robbing heat soak commonly found in aluminum intake manifolds. Average 30 HP gain between 5,000 and 7,500 RPM over competitors' high ram intake manifolds. Rated for up to 45psi of continuous pressure.
