The first step is to find a turbocharger that will fit the SL. The 3000gt vr4 turbocharger is a Garrett T25 turbocharger. This turbocharger can be found on other vehicles such as the Mitsubishi Eclipse and the Dodge Stealth.
Once you have found a turbocharger, you will need to modify the SL to accommodate it. This includes fabricating new exhaust and intake manifolds, as well as modifying the engine management system.
It is also important to ensure that the SL has the necessary fuel system to support the turbocharger. This may include upgrading the fuel pump and injectors.
Once all of the modifications have been made, the SL can be turbocharged. It is important to note that turbocharging a car can significantly increase the power output and torque, so it is important to have the car professionally tuned to ensure that it runs safely and reliably.