CSL Yellow DRL for the BMW 3 Series: What It Is and Who It Suits

When the M4 CSL came out, its yellow daytime running lights drew almost as many comments as its carbon roof. The color comes from BMW's GT race cars, which have used yellow lights for a long time, and it later appeared on the M3 and M4 CS as well. Regular 3 Series owners wanted the same look, and a CSL yellow DRL conversion has since become one of the most asked-about lighting mods for the G20.

What a CSL Yellow DRL Conversion Actually Changes

Each G20 headlight has two curved LED strips that act as the daytime running lights. The conversion swaps the LED boards behind those strips for boards that light up yellow in place of white. Nothing else in the headlight changes. The housing and the main beams stay exactly as they were, and only the daytime light color is different.

Photos don't always show it well, but on the road it stands out. After dark, or when the car fills someone's rear-view mirror, the yellow outline is what they notice first. It gives a standard 330i a link to the M cars.

Which Cars Can Take a CSL Yellow DRL

The kit fits three 3 Series body styles: the G20 sedan, the G21 Touring wagon, and the G28, which is the long-wheelbase sedan sold mainly in China.

If your car is a 2023 or later model, there’s one more thing to check. That year BMW gave the 3 Series its mid-life update, known as the LCI, and the headlights changed with it. Send BavGruppe your model year or VIN before ordering, and they can tell you whether the kit suits your headlights.

Their daytime running light range goes well beyond the 3 Series. It includes F-series BMWs, the G80 M3, the G82 M4 and several Audi models.

RGBW or Yellow: Picking Your DRL Option

The G20 kit comes in two versions. The CSL Yellow version stays yellow all the time and matches the factory CSL lights.

The RGBW version can change color. You can set it to yellow for the CSL look, white to keep the car looking stock, or a different color for a show. It's a good choice if you like to change things around, or if you might need white lights for an inspection and don't want to open the headlights a second time.

Before You Order

With some kits, the headlight has to be opened to reach the LED boards. That involves warming the seal, lifting off the lens and sealing it again afterward. If the seal isn't done properly, moisture can get inside. Anyone who hasn't opened a headlight before may want a lighting specialist to handle it, and most can finish the job in a day.

Rules on daytime running light colors aren't the same everywhere. Yellow is allowed in many places but not in all of them, so check the law where you drive. It's also worth asking whether the boards plug straight in or need coding to stop warnings on the dashboard.

Quick Answers

Does it change the headlights themselves? No. Only the color of the daytime running light strips changes.

Can I switch back to white? With the RGBW version, yes. The CSL Yellow version only shows yellow.

Does it fit the M3? This kit is made for the 3 Series. BavGruppe sells a separate option for the G80.

Final Thoughts

Few mods connect a regular 3 Series to BMW's racing cars as quickly as a CSL yellow DRL kit, and the car's shape stays the same. If you want to be able to change colors, the RGBW DRL version is the better pick. The full range of CSL yellow DRL and other daytime running light kits is on the BavGruppe Designs site.