When we installed the supercharged LSA engine back in 2013, we used a bolt-in replacement radiator from BeCool. We reused this with the 8.1L. The Tilden Motorsports wiring harness controls the dual electric fans, turning one on at 190 degrees and the second if the engine pushes up to 210 degrees. This is all controlled by the reflashed factory ECU. We also used the factory Suburban air intake to an Airaid filter and an Optima YellowTop to power it all.