I agree with the guy that stated to buy a used Xray. A well taken care used car is better than a new lower priced car. I had a TC4 and would not recommend it for that track. If you have to buy new and are on a budget I would try the BT-4. The thing about a used Xray is it is more durable so u will not break as often...second, if you don't like it you can always sell the roller for what you paid. Most of the common breakable parts for an X-ray are interchangeable. Say 2014-2016 not 100 percent sure on this so speak with others to confirm this.
Lastly, the TC4 uses imperial screws so any screw will not transfer over to a modern car...
Bottom line used Xrays are your best bet.. Even if u they are not all the same...