New FAST XCR LS3 Street Intake Promises Big HP, Torque Gains

There are all kinds of trick EFI intake manifolds for GM’s family of LS engines, but the problem with many is they are geared for extremely high rpm performance and are not really designed for everyday street applications. FAST introduced a new LS3 intake at the 2026 SEMA Show that looks to be the perfect solution for street enthusiasts. 

Called the XS LS3, its internal fuel rails create more plenum space for longer, straighter runners. It uses 11.5-inch runners to optimize performance from 2,500 to 7,000. Yes, it has a very wide powerband. 

FAST notes the XCR’s internal fuel rails allow the “simplicity of a single 112mm throttle body to have cross-ram-style runner length (11.5-inches), resulting in gains up to 45 HP/70 ft-lb over similar manifolds,” which is perfect for the street enthusiast. 

Each 11.5-inch runner tapers from a 4.28-square-inch bellmouth opening to a 1.21-by-2.58-inch port exit.

These gains are impressive for any manifold. We’re curious to get our mitts on a production version for some real-world testing. This intake should be available after the new year.