Edelbrock Manifold EFI Pro-Flo XT LS2 Black Powder CoatedEdelbrock part #71403 Pro Flo XT LS2 EFI intake manifold is engineered with a large plenum and tapered runners to deliver maximum horsepower and broad torque band throughout the rpm range (1500 7000 rpm). Features include a 90mm throttle bore opening and 2. 75" port exit height. This manifold produced 30 more horsepower over a stock LS6 manifold at 6500 rpm. Accepts GM OEM 90mm or Edelbrock #3869 throttle bodies. Compatible with LS1 Fuel Rail Kit