I have been running the TC5 with a 19t, foams on carpet since Jan.
The car was running great with the stock arms. At the regional race we hosted I tried the hard arms after getting the base with the stock ones. The car ran great still. In fact the car is faster than the driver. A TC5 won the regional in the 19t foam class. I think the car runs great. I use the a set up from the Novak race that RBOK tweeked from Jucha (sp?).
Great car.
God Bless