Overview Reviews Product Description 300-121 Holley EFI Holley LS EFI Manifold - 2x4 Dual Plane Holley EFI 2x4 Dual Plane Intake Manifold, LS Gen 3 LS1/LS2/LS6 engines Product Videos Custom Field Product Reviews Write a Review Write a Review × 300-121 Holley EFI Holley LS EFI Manifold - 2x4 Dual Plane Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *