I found a few sites that offer a speed limit increase. They work for every model but did not mention the diesel version.
Mods: BPC tune, AEM Meth Injection, BDP downpipe, Wagner intercooler, Bilstien B12 Kit, M3 Control Arms, MB Quartz Kit/Alpine Amp
Best 1/4mi Trap: 111.86
Best 1/4mi Time: 12.54