I bought this set with my TRF Dampers.
Becouse if you mount the TRF Dampers with the springs that come with the set, the rear end is to soft.
So i mounted harder springs on it and now it drifts perfectly.
And i hate it when you have a car with 2 differrent colors of springs on it.
These ones have a litle bit of paint on the 'tip' and the color shows you wich hardness you have.
Highly reccommended if you buy TRF Dampers !