By the time the E92 GTS rolled out, BMW M had mastered carbon composite manufacturing at scale.
Yet the GTS' trunk was metal- with a car already prohibitively expensive, it seems the engineers got stopped short.
In this Special Series, I loop in my experiences with this OE+ carbon trunk route to creating a lightweight CSL style trunk for the E9x M3.
Cheers,
- Matt / @m3_epoustouflant
Wing Reinforcements
Alsatek can add additional carbon layers by the traditional mounting points for GTS and GT4 wings. It does not have any functionality nor fitment aesthetics. It does add a few hundred grams.

In this entry, we start with the basics: I cover my unboxing impressions the E92 OE+ Carbon Trunk. It is both a stand alone product, and will serve as the basis to develop the CSL signature ducktail.

In this entry, I back to my roots and DIY the test fit of the E92 OE+ Carbon Trunk in the driveway, and further compare fitment to my previous CSL composite trunk.
Installation Notes
Professional paint & body installation is highly recommended.
Been done, done that.