iv'e just got an x pro and it's FAB!!
can't imagine why you would want a steel t piece though??
i found i needed more wieght in the front 1/4 of the car so i got the carbon fibre t piece and the new brass bulkhead (which i must say is an amazing idea with the weight you can put in and out from track to track)
also i put 20grams in both front pods to generate more side bite/roll through a corner.