I think since the limited run of 300 and the quick nature they decided to make them no spoilers/grills for the purples were made in body color. hence using the flat black like the daytonas. All other SRTs have body color matching spoilers/grills
As mentioned above. The PC SRT8's were not even scheduled to be built till it was decided not to build as many Daytona's as forecasted. There were 300 purple chassis sitting around with extra Daytona grills and spoilers. They are also numbered cars and the badges are currently being shipped. It makes the car kind of a one off option.