Oil Pump Delete kit – For TBI or TSP IRK models (Pre-mix)This oil pump delete kit will allow you to run pre mix on your TBI model, or TPI models that have the TSP Injector relocation kit installed. ** TPI MODELS: Please note this can NOT be used with your injectors in the stock location, this must be used with a TSP injector relocation kit or any other brand that relocates the injector to the intake. If you run pre mix with the injectors in the stock location you will starve your engine of oil ** TBI Models