Cart “Holley 300-137 Intake Manifold LS1 Street Single-Plane EFI” has been added to your cart. Continue shopping Remove item Thumbnail image Product Price Quantity Subtotal × Holley 300-137 Intake Manifold LS1 Street Single-Plane EFI $424.95 Holley 300-137 Intake Manifold LS1 Street Single-Plane EFI quantity $424.95 Coupon: Apply Sales Code Update cart Cart totals Subtotal $424.95 Shipping Enter your address to view shipping options. Calculate shipping Country / region Select a country / region… United States (US) State / County City: Postcode / ZIP: Update Tax $0.00 Total $424.95 Proceed to checkout