Has anyone seen a "piggyback" chip advertised for the Crossfire or Mercedes 320 SLK or C320? The piggyback chip made for other cars is a plug and play chip that fits inline with the PCU harness and simply adds or subtracts values to sensor inputs that feed into the MAP tables to produce the same performance gains as a reflashed chip, but without the need to swap out or reflash the OEM chip. They can also be installed or uninstalled in just a few seconds.