Looks like the embargo on the M Performance parts for the all new 4 Series has been broken thanks to Autocar.

BMW’s M-Performance line of accessories for the 4 series has broken cover and will hit dealers in early 2014, sometime after the debut of the M4 at the Detroit auto show. As in the past the upgrades will include copious amounts of carbon fiber trim and aerodynamic adders as well as alcantara surfaces to interior bits.

Performance tuning kits, exhausts, suspension, wheels and even a limited slip differential are to be available as dealer or port installed accessories. Depending on the market all of the items can be order as a full on package or purchased individually.

The horsepower increase to the 435i coupé’s turbocharged 3.0-litre inline six is around 30 more hp and a bit more in the torque department based on preliminary numbers, without increased emissions or fuel consumption.