Originally Posted by
sweems
Don't know about the current availability of $150 Xray chassis but they have been teasing the new touring car and many anticipate the X4 will be available in the next 1-1.5 months. That will trigger a ton of T4 chassis going on the for sale threads as people upgrade. I'd stay '17 and newer I think older than that and there were some parts differences that affect reliability.
2018 has the newer style shocks. Better to start there, but if you see a screaming deal on a 2016-2017 grab it.