| radiator hardpipe. Huge difference on the street. I remember driving with my setup (which at the time was pretty much the same setup you are currently running) and coming off the highway on a hot day the car would feel sluggish and just didn't have the same zip. I changed out the radiator and installed a lower hardpipe (stock has a soft pipe that likes to collapse on itself when hot, which restricts the flow of coolant). Made a huge noticeable difference!
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