We obtained the LQ9 FI Shortblock from Texas Speed with the full intention of putting an 88-94 mm Borg Warner Turbocharger on it. Loyd Mead purchased a Harrop 2300 Supercharger kit and put it on his 2004 GTO. It was one of the cleanest installs I had seen and the kit was very well put together. I immediately got interested in the Harrop and we bought a complete kit, New in the Box.
The LQ9 was not the average platform they had considered for the Harrop so we initially had to fabricate quite a few solutions to make everything fit. First, the coolant tanks were engineered to0 sit on the passenger side, as that is the driver’s side in Australia where they are made and sold. Steve fabricated a larger capacity reservoir to sit on the driver’s side fender.
That required us to move to an aftermarket overflow tank and to relocate the CPU from the drivers side inner fender (wheel well) to the interior of the car. Beyond that fabrication of a custom exhaust and heat shield were required for the Cold Air Intake.
CPU on inside of cab kick panel.
Another view of relocated CPU
We also switched from a 2004 radiator to a 2005 radiator. The advantages were the overflow plumbing, the routing of the hoses, and the 2005 had gfreater capacity and also had the drain plugs.