2022 is seeing a few new classes coming to Viking SCC. One I was most excited about was Slot It DTM (including the R32 Skylines too).
This is something we are discussing for the next DTM rounds. Trying to work out if there is a simple method of balancing the field. Had considered allowing slot it tungsten weights in specific sections of the motor pod for the Alfa and Merc, maybe two in the Alfa? Trouble is that there are different chassis variations for the Alfa, one is better than the other, and it starts getting complicated then. Hadn't thought about lightweight interiors. That could be a good option.Several people have reported that the calibra is the car to have for DTM classics.
Here in NZ, some have introduced some rules to balance this (for instance allowing weight only for the alfa and lightweight interiors).