Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) HB100020 Machined Ports: These manifolds have

Machined Ports: These manifolds have both the inlet and the outlet ports machined for a smooth transition and optimal flow path for improved throttle response

Adjustable steel or aluminum brackets clamp to square tubing

OEM frame cross member must be modified

and are fitted with a rubber grommet type seal to reduce the risk of leaks common with traditional O-ring seals

Precision sorted needle bearings to distribute load evenly

Holley EFI HP EFI Kit for GM LS1/LS6 Engines (BOSCH 02 Sensor) HB100020 Machined Ports: These manifolds haveHP EFI Kit for GM LS1 LS6 Engines (BOSCH 02 Sensor) Looking for a plug and play kit for your GM LS engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more! Got a stock LS engine? Simply download a base map and you're on your way. Got a turbocharged, nitrous fed LS engine on water meth? This HP EFI kit can control that too! Stop reflashing your factory ECU every time you make a performance modification.