I have another item that is going to make t-bar cars rock on low-med grip non-Paragon tracks. It's still in early stages, but the results are unreal. It's opened up my tire sellection tremendously. I gained as much as a 14 second improvement over the course of 8 minutes. It will be packaged as traction in a baggy. The eta is still a long ways out, but it will be worth it. Can't spill any beans yet... just want to tease some.