What company makes or sells a turbocharger for Saturn SL2?

There isn't a readily available, off-the-shelf turbocharger kit specifically designed for a Saturn SL2 from a major manufacturer. The SL2 wasn't originally offered with a turbocharger. To add one would require a significant custom fabrication project, sourcing individual components from various suppliers.

You'd likely need to find a custom turbocharger kit builder or assemble the system yourself using parts from companies like:

* BorgWarner: A major manufacturer of turbochargers, but you'd need to select a unit based on the desired power output and engine specifications, and then source the necessary manifold, piping, and other components separately.

* Garrett (Honeywell): Similar to BorgWarner, they're a large turbocharger manufacturer, but you'd need to do extensive research and possibly custom fabrication.

* Various aftermarket parts suppliers: Companies like Summit Racing, Jegs, and others carry individual components (turbochargers, manifolds, intercoolers, etc.) that could be used to build a custom turbo system, but it's not a straightforward bolt-on process.

In short, there's no "one-stop shop" for a Saturn SL2 turbocharger kit. It's a complex aftermarket modification.