Logan Motorsports Three-Valve swap kit for ’96-’04 Mustang GT’s needn’t be extensive, as the Three-Valve is nearly a drop-in swap on these cars. The major pieces are the twin-bore throttle body, throttle cable (remember those?), and exhaust adapter plates for mating the Two-Valve manifolds to the Three-Valve heads. Logan can also supply SCT XCal3 programming for the Two-Valve’s ECU. To use the Three-Valve computer (and thus retain the CMRC function) you need to swap in a donor car’s computer and harness—too much money and work for the small power gain.